leave fluid?? - posted in REV Chassis - Performance and Trail Models: Do you fill the coolant tank to the cold line, then pressure test the system? Or drain it ? Is this the best way to check if my inner head gaskets have gone out, or start the sled with cap off and watch for bubbles?. If the coolant evaporates off - they won't see anything on a simple inspection and a slow weep won't show up on a leak down test as sometimes the leak only happens when the engine is operating. Find great deals on eBay for motorcycle coolant pressure tester. If those leak near the lIM it'll run down the bellhousing. Coolant system pressure test kits are cheap to buy, I'd check the system's ability to hold pressure. Sometimes it happens daily on first drive only other times the leak is not daily. The temperature gauge will fluctuate as a hot bubble passes the gauge temp sensor. Putting pressure on the system will cause it to leak and reveal the leaks location in the process. Before this can be done, you need to drain the cooling system. Ok - lots of. any suggestions on the. Did a compression check that weekend, all were within specs. Fortunately, Nine out of 10 times, engine coolant leaks are easy to find. A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ability to hold pressure. You will need to replace the radiator cap. That’s what I was figuring - if it held pressure that much longer than the instructions said, then the leak was likely with the test equipment or the connection. 7L Dodge or Jeep vehicle starts and runs and has been running for any length of time, let the engine cool down completely before doing this test. Another tool you may opt to purchase to identify issues with your coolant system is a pressure tester. I have a 2001 Ford Explorer 4. This is where a pressure test may help. The pressure tester tool is basically an air pump, and the tool may be borrowed from a local auto parts store. So I think I've read ever article on here about coolant leak in my find and replace journey. BELEY Automotive Radiator Pressure Leak Tester Vacuum Type Cooling System Coolant Pressure Tester kit for Universal Vehicles 5. But cooling system is still pressuring up but mechanics are stumped. ok I've been on here a few times about coolant leaks and u guys have been a great help, now just recently my radiator sprang a leak on the side and I had to replace the radiator $$$ and now on a daily basis I notice coolant leaking again but under the motor somewhere. Coolant leaking GM cracked cylinder head, disassembled and cleaned. Putting pressure on the system will cause it to leak and reveal the leaks location in the process. Pressure Testing is a non-destructive test performed to ensure the integrity of the pressure shell on new pressure equipment, or on previously installed pressure and piping equipment that has undergone an alteration or repair to its boundary(s). The blown head gasket and/or cracked combined with engine combustion pressure provides a leak path for coolant and/or combustion gases. However, if the coolant is leaking from your water pump, that can get a little more expensive. A coolant leak can be really hard to find. I am using a pressure tester to check and see if I have any coolant leaks. 5mm x 32mm radiator adapter, 15mm x 32mm radiator adapter, radiator cap adapter, hand pump with tester head gauge and hose, and carrying case for your convenience. ok, thanks for response. Some pressure testers will also pressure-test your radiator cap. Most people don't check the fluid levels in their cars as often as they should. Pressure testing it cold may not show the leak. If I am going to pull a running and worn out engine to rebuild it, I do the treatment before I take it down. He did say if the coolant has been watered down too much it could has evaporated. As a backup, the surfaces of the pipe ends are wetted with LOKPREP sealing fluid. You may loan a tester from your local auto parts store. It also lets you know if your cap is working correctly. They gave me a call and said that it wasn't a coolant leak, but that I had a loose oil line and it was leaking oil. What causes a VW Passat to lose coolant pressure when the test is OK and no water is showing in the oil? Unanswered Questions. : OK, enough futz-ing around, so I tracked down a Leak Testing Set. It was the impeller shaft bearing and seal. I wonder where the coolant is leaking from. When was the last time you inspected/tested the radiator cap? Snap some piccies of it and post it up. What are 3 examples of corporate mergers? 438 want this answered. But, I'm wondering if anyone has found a standard pressure tester or pressure test adapter (I have the standard Stuart tester). High Pressure Testing Equipment for the oil & gas, automotive, hose, and other industries for specific objects and a wide variety of tests. The test involves very little time or labor, so a friendly technician may do the test. I have a mysterious coolant leak that i cannot find from a visual inspection. This same sequence happens over and over whenever I drive it for awhile. There is considerable variation in these numbers and they are not critical for home inspectors to know because we are not testing refrigerant pressure. My car is leaking coolant onto the garage floor under the radiator, but my mechanic couldn't find the leak even with a pressure test. My dad has a 2004 Sierra 1500 4x4 5. Occasionally, my 2006 with Vulcan will have a puddle of coolant under the car. Some pressure testers will also pressure-test your radiator cap. If recovery tank level does not change when engine is being warmed up, this is a sign of a leak or of a very low coolant level in the pressurized circuit. Putting the car up on a lift and inspecting the heater pipes is easy. The replacement plastic tanks are of poor quality material and may cause you grief if you go with them so should be avoided. Now that we understand how your cooling system works, we can discuss how to properly pressure test your cooling system. This article shows you how to identify and isolate coolant leaks the professional way, and repair the cooling system with a reasonable cost as well as minimum down time. It should be able to hold something like 16-17 psi without leaking. Loosing coolant for approx a year with no visible leak. 0 BHW engine with 80K miles. Clamp one side to the tester and the other side to the coolant tank. it seams to be coming. If no coolant reaches ground, you could have an internal leak. BUT, my wife just arrived home and I took another look and noticed some sprays of coolant again. MASTER COOLING SYSTEM PRESSURE TEST KIT AND VACUUM REFILL KIT is rated 5. I've also bought some grey RTV instead of the red RTV, hoping to get a better seal when I put it back together. leave fluid?? - posted in REV Chassis - Performance and Trail Models: Do you fill the coolant tank to the cold line, then pressure test the system? Or drain it ? Is this the best way to check if my inner head gaskets have gone out, or start the sled with cap off and watch for bubbles?. The test can be done at home or at the shop. Re: Mercruiser 470 pressure test Sounds like the weep hole is clear (sometimes folks see the coolant leaking out and plug the hole to "stop the leak"), and with no coolant leaking looks like that is not your source of coolant in the oil. While wiggling the hoses, check for a drop in pressure or a coolant leak. Seems like a weird place to leak at? Was thinking AUX-pump but isnt it a little bit to far back for that? (leaking around the flexipipe. Mechanics checked everything out, pressure test coolant system, oil analysis, etc. Did a pressure test on my radiator and coolant system, while cold I put about 16 lbs. I think it was at the Pueblo event when it was super hot and where a lot of big bore cars were suffering over heating issues that I loaned it out. You don't always get visible coolant in the oil, just depends where the leak actually is. 3) Buy a new system and after pressure testing the inside pipes, utilize existing pipes. " It is a fluid that goes in a pump gadget. However, if the coolant is leaking from your water pump, that can get a little more expensive. It has to be going somewhere. The process to find a coolant leak is really easy if you know how to do and have the right tools. Once enough pressure has been released (the caps preset rating), the pressure relief valve is again closed by the spring. If your vehicle tests positive for a head gasket leak with this test, you should take it to be inspected by a licensed mechanic. However, used the same pressure tester with engine running, per the instructions, and the system gradually built pressure from 18 lbs to 25 lbs before I stopped the test. When your coolant heats up it pressurizes your cooling system from the expansion which can expose leaks. The best way is to do a leak down test ( a process of actually introducing compressed air into the cylinder -)- to confirm that the cylinder heat gasket is ok and there is not internal leak in cylinder head or engine block. If an individual expansion tank is installed, which is mostly the case today, the expansion tank cap is equally important. I'm a college student so money is kind of tight. The first is an external coolant leak typically from the driver’s or left side head gasket, this affected the pre 2003 models specifically and ultimately led to the WWP-99 campaign where Subaru added a “coolant conditioner” otherwise known as stop leak and extended the warranty period to 8 years or 100k for external coolant leaks only. i dont think they checked it when they did the pressure test. Ok so pump is changed I drove the truck round trip a few hours, parked it and no leak. I get a lot of questions about people that can’t locate their coolant leak. Now you need to correct the coolant level (make sure not to overfill the system) Perform a cooling system pressure test to ensure no other leaks are present. lastly have an emissions test run with the radiator cap off and at running temperature. I'm gonna do a quick check for oil in the coolant and coolant in the oil, and when I can Ill be pressure testing the coolant system to see if and which cylinder is burning it, but thats dependant on someone else. I topped it up and seemed ok after a few days driving. Pressure Test the Radiator Cap. many people slow/stop coolant leaks by using 1 bottle of Subaru Coolant Conditioner per directions on the bottle. When the cooling system is placed under pressure, for each pound per square inch (psi) of cooling system pressure, the boiling point of the coolant is increased by:. cant find where the coolant is going. A pressure test is 35 + vat. It is common sense that the oil of any engine should never mix with the coolant or water. Doing tailpipe heat dye test to see if it’s burning coolant and needs head gaskets. The best way is to do a leak down test ( a process of actually introducing compressed air into the cylinder -)- to confirm that the cylinder heat gasket is ok and there is not internal leak in cylinder head or engine block. -Eric Image Unavailable, Please Login. Ok, I changed just the radiator cap and drove it last night for a while. Topped it up and all okay again. When looking for leaks at the radiator, inspect the side tanks on the radiator for signs of leaks or fresh coolant. 2001 CX613 MACK IS BUILDING COOLANT PRESSURE DID CYLINDER LEAK TEST OK,DISCONECTED AIR COMPRESSOR OK,REMOVED FAN BELT - Answered by a verified Technician. How do you explain the empty coolant reservoir if there are no leaks? leaks? when the heat is on. About 70% of these are testing equipment. Then the excess pressure (coolant,air) can squish through the overflow tube to the ground or the coolant reservoir. : OK, enough futz-ing around, so I tracked down a Leak Testing Set. Follow the steps in this video to see how to fix minor coolant (antifreeze) leaks in your 2005 Hyundai Santa Fe. Have them use "dye test" instead of leak down test. Has anyone been experiencing a cooland leak near the front left (driver) side of the 330? I took it in for service today and the pack of monkey's at BMW could not find the leak (it is pretty obvious). #6 had the lowest pressure, with about 380/390 (did it twice). Start over new and test for cooling system leaks with a pressure test. In most cases, a leak inside the car or truck stems from the core component in the heater, but coolant can also blow out as mist from the defroster. Purchased a radiator pressure tester kit, thinking I could get the leak to show up under pressure, but the system held 16# for 20 minutes. Referred me somewhere else and they want to do pressure test. To see how frequently Chevrolet Impala problems occur, check out our car reliability stats. it seams to be coming. 2- Head Gasket Check- Negative (thank goodness!!) 3- New Reservoir Cap- NO CHANGE. They said they also smell odor but aren't sure it is antifreeze, say it may be exhaust. I checked the coolant overflow tank recently and it was nearly empty, although there appeared to be a full radiator when opening the radiator cap. I have replaced the cap with a new one, there are no visual signs of the leak and today I did a pressure test. Like a stick through a hose. Even had it tested by NRMA with the same results!. Radiator Pressure Test - Leak is Slow. Radiator cap? coolant leak. (which where a bia!!) during the install i had to basically lay on top of the engine to get the the top connectors behind the engine. A fluctuating needle may indicate an exhaust gas leak. They have ordered the parts, which are on back order, but they won't let me have my car back, as they say it is dangerous to drive with a hybrid Coolent leak. Could this be from a bad cap on the pressure tank?. I advise those readers to check for combustion gasses in the coolant, as explained later. The kits at O'Reilys have adapters but none fit. Purchased a radiator pressure tester kit, thinking I could get the leak to show up under pressure, but the system held 16# for 20 minutes. It drips from the holes on the underside of the bellhousing. He had checked the radiator all the horses etc and the water pump and there was no leak. When I first put it together I had a small coolant leak around center spark plug. I have changed the throttle body heating plate as. There are situations where there is a leak, but the cause is not apparent – a very small leak in the radiator for example could evaporate away before it's noticed. Is there a way to test to see if it's the head gasket? The car ran fine when it was dropped off??? It leaks without being pressurized????? What am I missing? It looks like it's leaking more toward the center of the intake/head. Coolant makes a lousy lubricant and can cause ring, cylinder and bearing damage if it gets into a cylinder or the crankcase. No leak but using coolant? There is a leak. Likely the heat exchange is leaking shell side to tube side. The service guy said he would look into it and get the leak fixed. If you did a pressure test the tester used should have a gauge. I was driving it home and it began to over heat. How to add a coolant pressure sensor and avoid a rookie mistake Know before you overheat, not when you’re overheating. I had a coolant in oil and around the timing cover situition an I just rented a pressure tester at autozone. • yellow – antifreeze coolant or windshield washer fluid • clear – condensation from the air-conditioning system (normal) • dark brown or black – engine oil _____ 1. Pressure-testing the cooling system and starting a cold. If your concerned put some coolant exhaust gas tester dye to make sure. If you notice pressure even when the engine is still cold that's the case. If there is no tap, disconnect the bottom hose. Looks to be the oil cartrage filter housing which was replaced a few days ago. • ANY CAUSE FOR EXCESSIVE FUEL PRESSURE CAN CAUSE AN INJECTOR LEAK CODE. The towels I placed yesterday show that it's leaking right below the intake/head. (which where a bia!!) during the install i had to basically lay on top of the engine to get the the top connectors behind the engine. Could be worth checking the likely suspects, I'm no expert I might add. the new heal-a-seal tm engine oil sealer - and oil stop leak - for engine main bearing seals, valve cover or timing chain gaskets, or any other external engine oil leaks - such as from the head gasket, cracked or warped engine head, engine block, etc. • yellow – antifreeze coolant or windshield washer fluid • clear – condensation from the air-conditioning system (normal) • dark brown or black – engine oil _____ 1. Show 40 post(s) from this thread on one page OK, so I just drove to dealership is fast. Referred me somewhere else and they want to do pressure test. entire engine area for coolant leaks, including both charge air coolers and the external coolant piping at the rear of the engine. Otherwise, yer gonna have to make sure you git all the air out of the system, go fer a drive to git the pressure up, stop and look/listen fer the leak. They have ordered the parts, which are on back order, but they won't let me have my car back, as they say it is dangerous to drive with a hybrid Coolent leak. A pressure test should fail and show you where the leak is coming from. my waterpump just went out and before it went out it started pissing from the tank,yes the bottom i thought it was a hole but learned that when our cars start to overheat the bottle relieves the pressure from the bottom of the tank,my water pump went out about two days after i noticed the leak. The pressure test you performed isn't capable of producing the pressure of an engine under load. If the coolant is low and/or the engine has been overheating, pressure test the cooling system to see if it holds pressure. They did a pressure test, and it slowly lost pressure. No external leaks can be found. Re: Mercruiser 470 pressure test Sounds like the weep hole is clear (sometimes folks see the coolant leaking out and plug the hole to "stop the leak"), and with no coolant leaking looks like that is not your source of coolant in the oil. Cab anyone tell just by the picture where this coolant leak is coming from? I circled in black where I think it is but don't know what tht part I'd. About 3 weeks ago I noticed it was losing coolant so topped it up and within a couple of days the level had dropped to where the header tank narrows into the neck. net; General E30 M3 Discussion; If this is your first visit, be sure to check out the FAQ by clicking the link above. First of all, I'm very very sceptic to miracle stuff on tins So called "snake oil" products if my language memory is correct:-) However, I just had what seems like a very positive result with the mentioned Bar's leak coolant product. They filled the coolant, then by afternoon, the coolant was leaking. No leaks under pressure test again and tested ok on turnpike. An inexpensive way to pressure test at home is to rent a coolant system pressure tester from an Auto Zone or Checker/Kragen, if you have one near you. IMPORTANT: This test has to be done with a completely cold engine or you run the risk of getting scalded by hot coolant. Everyone has been great offering ideas about cleaning the oil out of my engines cooling system. If your car is losing coolant and there are no apparent external leaks YOU HAVE A SERIOUS PROBLEM. New Topics; Mark Channels Read; Member List; Today's Posts; Calendar; Forum; S14. pretty sure he burped it too, should be standard knowledge for most mechanic. The arrow on the calibration sticker shows direction of flow. -That other ‘special ingredient’ we need to increase boiling point being PRESSURE. The pressure test will also check for internal coolant leaks, like a crack inside the engine or a head gasket that has failed and is leaking coolant inside the engine. When it leaks from the upper sometimes it is a bad leak other times it is a few drops. This is the screw-on cap on the coolant pressure tank, which is in the engine bay at the left-rear corner. Shop with confidence. If there is a tiny leak in the low-pressure side and the technician doesn’t pump the pressure up using nitrogen then the leak will likely not be found. If your vehicle tests positive for a head gasket leak with this test, you should take it to be inspected by a licensed mechanic. Sometimes pressure test does not help. ok, thanks for response. When you opened the cap, you depressurized the system so the leak was not as bad. If it WAS getting hotter than normal the result would be even more pressure in the system (assuming it WAS properly sealed). (which where a bia!!) during the install i had to basically lay on top of the engine to get the the top connectors behind the engine. On this stripped-down and cleaned head we can see the crack. If it was leaking into the carpets footwell you would be swimming by now. Next thing i know i test drive the truck to the store and I noticed its leaking coolant from around the middle of the engine bay. Coolant in the header tank might appear agitated and might spew violently with the cap removed. I crawled under the truck today and its leaking on the passenger side near the front of the block. I seem to be losing coolant from somewhere on my 03. You pump air from the top of the coolant tank/radiator through it with a squeeze bulb. Also look at the balance rates, if the tip is leaking fuel then the balance rates may be out of specification. 20555 March 17, 1988 ALL LICENSEES OF OPERATING PWRS AND HOLDERS OF CONSTRUCTION PERMITS FOR PWRS GENTLEMEN: Subject: BORIC ACID CORROSION OF CARBON STEEL REACTOR PRESSURE BOUNDARY COMPONENTS IN PWR PLANTS (GENERIC. Bubbles should not be present if system is sealed. 1) Drain the unit then fill it with coolant. A compression test might not be a bad idea either, but if it's running OK you're liable to find the compression to be OK. Ok so pump is changed I drove the truck round trip a few hours, parked it and no leak. They said they also smell odor but aren't sure it is antifreeze, say it may be exhaust. It does look like my antifreeze is a little low but it could be a leak somewhere. THE PROCEDURE. Closing the valve to the flow line (V2) and opening Valve V1 5. Thanks for your question about your Murano. Another reason for not ignoring the Check Engine light is that a vehicle with a Check Engine light on will fail an OBD II plug-in emissions test. The most common pressure tester is the hand-pump device with adaptors to fit different size caps and the filler neck of the radiator. 7 out of 5 stars 4 $129. My concerns are what damage may have been done buy running with coolant in the oil. No leak but using coolant? There is a leak. The recall applies to models with 1. The arrow on the calibration sticker shows direction of flow. A small extendable mirror and a flashlight will help find the source. I sprung a coolant leak on my KVF 700. They offered to pressure test the coolant system & found no leaks. 3L and 150k. If the HG is leaking, it will probably smell a little funky in the reservoir. ( believe it is a hose connecting to the radiator due to where it was). Replied by valde on topic Chevy Silverado coolant leak First just do coolant pressure test without dye. If air bubbles are seen in the coolant, the block or head may be cracked or the head gasket could be blown. I need to lower the coolant level in the bottle and then check for bubbling. See your John Deere dealer for testing. If recovery tank level does not change when engine is being warmed up, this is a sign of a leak or of a very low coolant level in the pressurized circuit. A "leak down" test is a pressure test applied through the spark plug hole with the piston at TDC to measure the ring and valve seal in a 4 stroke engine. Any ideas? How can I pressure test? Unrelated but I seem to be missing a charcoal cannister hose?. which is now dry BUT after driving 30 or 40 miles the coolant level in the canister is down below the mark again. I finally determined it was the water pump leaking at about 86,000 miles. The main complaint for this 1999 Jeep Cherokee, 4. The head has been checked OK. I cannot find the coolant leak other than if it comes out the overflow. This indicates coolant leaking into the combustion chamber. OK: I'm not certain how and where intake gaskets on this seal but many could very slowly leak in, NOT out to see and burn it slow enough for now you don't see it. There are situations where there is a leak, but the cause is not apparent – a very small leak in the radiator for example could evaporate away before it's noticed. 3 Take Care of Your Coolant The coolant concentration should be maintained at 50/50 mix of Motorcraft® Orange Antifreeze/Coolant. No, leaks are not found; Go to step 6. Pressure tested the cooling system yesterday and all good, hold almost 1bar for ~10 minutes. Discover over 620 of the best Selection Cooling Leak on Aliexpress. Allow the engine to cool down completely. 2001 CX613 MACK IS BUILDING COOLANT PRESSURE DID CYLINDER LEAK TEST OK,DISCONECTED AIR COMPRESSOR OK,REMOVED FAN BELT - Answered by a verified Technician. Per instructions from the manual I pumped the pressure tester up to 15 PSI. What causes a VW Passat to lose coolant pressure when the test is OK and no water is showing in the oil? Unanswered Questions. Oh jsolo one other side benefit of a the reservoir being part of the pressurized system vs an overflow is the coolant is always circulating through the clear reservoir, this. EK the premium liquid cooling gear manufacturer is releasing the EK-Leak Tester. There are also gaskets for the intake manifold to keep the coolant from leaking out at that point. I think I'd leave it under pressure test overnight or when not in use time there's a risk you can avoid if that's happening. They have ordered the parts, which are on back order, but they won't let me have my car back, as they say it is dangerous to drive with a hybrid Coolent leak. So I pull top cap off replace it and no problem. and the waterpump was covered under the 100,000 mile warranty fyi. So after replacing my cam seal I notice my coolant resovior was empty so I filled it. Here's the problem with the water cooled oil cooler theory. Start the truck and boost up the idle to about 1000 rpm and let it run. Pressure lost often happen in that condition. So I guess I will see how it goes this week. This is a test unit and test fluid that changes color with the presence of exhaust gas in the engine coolant. I am losing coolant. No smells oil ok. If the engine in your 4. no head gasket leak, coolant system maintains pressure test, no coolant in oil. Water pump leak test, check visual, there must be residue "red colored",under neath the water pump or on the center belly pan or passenger side engine cover,VW coolant leaves visible track of leaking coolant. When the coolant gets hot and exits into the bottle, it should suck back into the radiator when it cools down, keeping the radiator always full. A cooling system pressure test is a good idea to verify the system's integrity, so by all means have that done, but you may get the problem solved by just replacing the cooling system pressure cap. Shop by category. Ok, I've been having some issues with my 98 Eldorado ETC loosing coolant. About 3 weeks ago I noticed it was losing coolant so topped it up and within a couple of days the level had dropped to where the header tank narrows into the neck. There are really only three common causes for coolant leaks, although each type of leak has several possibilities, varying in severity. This oneHOWTO article is going to discuss about how to check for a coolant leak. Have them use "dye test" instead of leak down test. How much should i pressurize the system? Thanks. No leaks under pressure test again and tested ok on turnpike. I have a loaner while they work to repair the leak. I have taken it to the dealer. The coolant leak on these engines was at the gasket between the intake manifold and throttle body or, in some cases, between the upper and lower intake manifold. Contaminated Coolant and Head Gasket Problems. It is common sense that the oil of any engine should never mix with the coolant or water. eBay Logo: Shop by category. If you suspect you have either of these issues, you should perform this test immediately. guys, I am new and desperately need help here. Remove the test equipment from the cylinder head and repeat leak test for any additional cylinder heads. I have the exact problem and the exact scenario with 3 mechanics :). Remove the radiator cap and open the radiator drain tap. We have a slow coolant leak on my sons 1988 300TE. If coolant leaks externally, use a flashlight and follow the coolant to its source. Malibu's loss of coolant turns into a torrent within. Rule out everything (water pump is suspect here) and rule out the engine miss caused by bad spark plug or ignition coil before using sealer. If pressure holds then check valve is OK b. I know guys were testing for blown head gaskets, system leaks, bad radiator caps, etc. We add a special dye and monitor the coolant system under pressure to see if liquid is circulating as it should, the dye will show us where the leak is at. When I check the level in the expansion tank it is way below the minimum mark. I fixed this and tested a fourth time. They filled the coolant reservoir back up and send me on my way. : OK, enough futz-ing around, so I tracked down a Leak Testing Set. It hasn't been put up on a rack yet though. that it was leaking coolant. If coolant leaks externally, use a flashlight and follow coolant to source. Coolant is hitting the belt and spraying up onto the hood when I'm driving. The recall applies to models with 1. Ok, I have a 2009 Prostar. 2nd pic is the serpentine belts lowest wheel which is right behind that area with the 2 bolts. This indicates coolant leaking into the combustion chamber. Hello! The snow has finally begun to melt in Wisconsin so I busted my '87 4x4 M/T Cargo out of storage about a week ago. Try increasing the rail pressure, we find injector nozzles may leak at idle pressure, but do not leak at higher pressure. System was pressure checked for 3 hours with res line plugged at the reservoir. Coolant leaks can certainly be risky on your vehicle as this can reduce the system's pressure, drop the coolants level, and increase the chance of reducing air into the system. It is basically a non-destructive technique that corrects the performance of the. It appeared wet around the radiator cap so I put on a new one. And allowing air back in not letting the vacuum pull the fluid back in. Any leakage in terms of coolant level in the reservoir is neglible/minor over time. Turn on the heater in your vehicle without starting the engine to allow the coolant system to develop. If there is combustion residue in the coolant the fluid in the test kit changes color. I went to Autozone and got the pressure test kit, put it on and pumped it up to 18 pounds. Hook it up to a COLD vehicle and pressure test, easy to identify leaks. So he's on his way back out to Alberta again, topping up the coolant every once and in a while. i think what you're saying then, is that the engine can continue to run and does not overheat unless of course i lost enough coolant and did not replace. Pressure testing it cold may not show the leak. You can find your leak by pressure testing your coolant system. Search in titles only Search in Engine Mechanical only. Turns out everything checked out ok, but just in case I still lose any coolant can a dye turn up anything? The reason I ask is that I may have an intake gasket leak that I might not know about. no head gasket leak, coolant system maintains pressure test, no coolant in oil. If our gas piping won't hold 10lbs overnight (or half the pressure of the gauge being used, usually a 30lb gauge), we track the leak down and back out whatever piping we need to to repair the leak. 0 liter going strong! Be sure & check out Part I as well!. If the air pressure drops during this time the cylinder head has leakage from the cooling passages and is not suitable for reuse. Good evening. Look for the coolant leak while under pressure, and if one is not found externally it is probably in the head. This AM when I got home I noticed a very small drip of coolant. Ok so the coolant leak tracing has started again, cover off looked everywhere from above but couldn't see much, so whipped wheel off and had a look around. The N75 valve when deactivated (normal state) allows charge pressure air to act on the wastegate actuator. Drove it, got on the the throttle pretty good. If after a short time there is no pressure loss indicating a coolant leak and none of the hoses blow or swell up, then all is OK. Coolant is leaking Inspection Service If you suspect your car may have a coolant leak, perhaps because the temperature gauge is reading higher than normal, it may not be hard to find out where it’s coming from. An inexpensive way to pressure test at home is to rent a coolant system pressure tester from an Auto Zone or Checker/Kragen, if you have one near you.