What causes air in coolant system diesel reddit. If any doubt replace the cap. If you suspect air pocket, try bleeding the coolant by loosening the allen bolt. As the coolant cools down it creates a vacuum in the cooling system. If you were loosing coolant with no pressure on the rad hose, resevoir, etc Detroit Diesel, for example, will deny a warranty claim on an EGR cooler if the technician fills the coolant from the top of the surge tank. compressor and the headgasket works like a checkvalve. Jul 22, 2023 · In summary, coolant is of utmost importance for diesel engines as it prevents engine overheating, enhances engine performance, and extends the engine’s lifespan. Tri-fold tonneau cover, weathertech vent visor,Ford floormats and splash guards. Feb 28, 2011 · 851 posts · Joined 2008. The engine heats up and the leak stops . •. Waited a couple days for parts to show up. So antifreeze usually ethylene glycol is added to the water Cut a hole in the bottom so there is no pressure build up and insert. 6. That’s why there’s a puddle of water that forms under an idling vehicle in the summer Apr 27, 2007 · IMO, there probably should be some residual pressure in the cooling system if its in good working order. The coolant helps to keep the engine at a constant When coolant heats, it expands, adding pressure to the system. When you're topping it up do it from the thermostat housing cap not the reservoir, and bleed it every time. Remove the radiator cap with the engine off and cooled down. Repeat step 3 - 5. I filled the system and ran it to get any air out that I could. Overflow/splash will stay in upside down container and flow back into radiator. Just because it makes such a mess when you get a huge air pocket out and coolant literally splashes Either flush the coolant yourself, or take it to a gas station garage and ask them to do it. This, combined with the fact that the base materials of a OAC coolant react poorly with plastic (re: the intake gaskets in 3x00 engines vortec 350s) makes for a horrible combination. Lately, there is excessive pressure in the cooling system. It will hold 11 psi in the cooling system for at least an hour when cold using a pressure tester. 199K subscribers in the AskMechanics community. The AC fan blows air over the coils and that’s how you get cold air in the vents. Fill the radiator If you have an air compressor and an air gun leave the fuel filters loose and push air into the tank till fuel comes out of the filters and tighten them back up (no this will not cause excess air to get in the system) or just fill the filters with fuel/trans fluid/or seafoam, same with the oil but obviously fill with oil lol Jun 3, 2019 · So your "25psi" relief valve is set to relieve pressure at 25 psi gauge. However, it could be a slew of other things too. Without proper coolant, the engine would be prone to overheating, which can cause significant damage and reduce its efficiency. After replacing the coolant, you have to bleed the rest of the air out of the system or you risk overheating. Once the engine is at temperature and no air bubbles are coming up out of the funnel you can remove it and put the radiator cap on. May 30, 2020 · The build included upgraded rods, cams and studded heads. Only starts dropping after the fan has been on for 15 minutes non I replaced it and did a thermostat at the same time since the hoses had to come off anyway. Today we mainly talk about water cooling and belt driven engine. I would test the other way. At that time there was no oil/coolant mixing it just leaked to the outside. HarleyD headlights, Duplicolor bedliner coated bumpers, 08 rear bumper and taillights, herculiner Yes. 3 and 6. 0 you have a cracked head. It is simply heat - the air above the fluid level heats up, expands, push coolant into system as rubber hoses are flexible their volume increase, coolant level drops. So when the coolant cycles through out the system, it should bleed air out from the radiator cap opening. May 1, 2014 · 10 posts · Joined 2014. [deleted] • 5 yr. If it's clogged you'll see cooler spots. I thought it might be a blown head gasket, but wouldn't that lead to lowering coolant levels instead of maintaining the same level? Any ideas on what this could be would be helpful. If it doesn't you need to find out where it is going. 5 6. I've never seen a coolant bottle that recommends distilled water, and I've never seen distilled water marketed and sold for mixing with coolant. There could also be a leak between the pump and engine block if the pump's gasket has failed. 8. 10. Since This isn’t entirely true. Insert your funnel into the radiator. If this is happening it should be watched closely, and apparent coolant loss should go away within a few heat cycles. As the coolant in the engine reaches temp, the t-stat opens and there's a flood of VERY cool coolant, this causes the temp gauge to drop and the t-stat to close because the coolant is below temp again. A worn water pump can develop leaks in two ways: 1. Those engines are known for head gaskets. As the bubbles implode on the outside of the cylinder wall, the metal will eventually corrode and form cavities. Faulty water pump: A worn or damaged water pump can result in reduced coolant circulation, leading to coolant loss and potential overheating. As others have suggested, it’s a cylinder head problem, either a crack, or pitting around the injector cups. Hey fellas, it's been a minute since last post. #2 · Feb 28, 2011. Took the truck to volvo dealer, they diagnosed it as oil cooler. The new rad likely has more volume of coolant and you no longer have enough expansion space in the surge tank. When the head warps, the air-tight seal (head gasket) between it and the bottom of the the engine (the block) fails and allows oil and coolant to mix. Sep 11, 2023 · The water pump is the heart of your BMW’s cooling system, circulating the coolant through the engine and radiator. Flushing your coolant is a great way to get rid Feb 7, 2024 · The coolant level probably dropped as the cooling system was bled of air over time. Hi all, decided to share my pain with VW community after ~8 months of troubleshooting by VW (Australia). I closed the radiator cap and let everything cool down. air bubble in coolant system. Sep 3, 2012 · klhansen. Generally speaking, those are the only two places they get clogged. This is to purge out any pockets of air which might be in your cooling system. Leaking radiator or heater. Cylinder liners physically damaged or cracked ever so slightly or head gasket are my guesses. Boiling would be expected, but you should be able to burp the majority of the air out before it gets that hot while it’s idling. Nov 16, 2021 · 5. Have the heater core on high and run the engine to operating temperature. That’s the drain hole for the evaporator coils in the dash. I dont know why i wouldnt have considered that. This can lead to serious damage to the engine and may even cause it to catch fire. It's inexpensive and easy to do. It’s a closed system when the cap is sealed. Keep your coolant system clean. Check it every few minutes and fill with coolant, once it bleeds the air out of the Attach to the radiator and fill it halfway with coolant. Leaking shaft seal – The water pump’s metal impeller shaft passes through a rubber seal. The 2014-2018 5. Here are the steps to help you with this procedure. 2009 challenger I noticed my car making a bubbling sound when I got out so I lifted my hood and seen my coolant completely filled to the top of the overflow side and just bubbling also leaking from the hose connected to the overflow side, I did replace my radiator about 2 months ago could I have just bled my system wrong there’s a new cap don’t think it’s a pressure issues If there is hydrocarbons in the coolant system, overheating it likely popped your head gasket. After I noticed the coolant spewing from the overflow tank. This is a death sentence for an engine because the oil no longer This interaction can occur between steel and aluminum components in the cooling system and cause them to be eroded away. The block has to heat up, and transfer to the coolant before that can be transferred to the cab. I have changed thermostat, radiator cap, and pulled water pump and checked it, passed combustion test, also flushed what lines I could except the radiator. Ideal gas law, PV/T=constant is applicable. The engine cooling system and HVAC system are two separate and enclosed systems. We replace the coolant reservoir. Probably a weak HG seal. Failure to properly Mar 19, 2021 · Had coolant tested for carbon and blue turned to green & replace the head gasket and studs. For liquid there are plenty of good options. Pressurize the the intake system above 20 PSI and check for bubbles in the coolant. It runs at about 188°- 196° At 206° the fan kicks on. How to bleed coolant system Have a 540 and just replaced my expansion tank and I have to bleed my coolant system, I do the procedure and check the level but I still keep getting check coolant level. magnesium especially as well as other metals get destroyed from sitting in old coolant for years. Without this protective coating, fuel combustion in the engine can cause the cylinder wall/liner to vibrate, which generates more air bubbles. It's an expensive fix. Even when opening the ventilation cap when filling before starting, you will still have some air left in the coolant. #9 · Jun 4, 2011. I've never seen a cooling system blocked with "deposits", other than rust/goo on 30 year old cars with about as old coolant in them. Is the coolant Pink? Toyota usually uses a Pink HOAT coolant. Any trapped air hopefully is pushed out into the overflow tank. I find that weird. My aux water pump works sometimes, i hear it push fluid. 2. You can buy a block test kit and test it yourself to verify. The pump sends cooling fluid to 4. A class-8 on-highway truck seemed in fine condition when it left the West Coast, but at the end of its 6,000-mile cross Dec 2, 2012 · Shut the engine down and wait till engine is cool. Sep 28, 2010 · The Basics of Diesel-Engine Coolant. Check the thermostat housing and the gasket for it, common fault. Use compressed air to remove dust and light dirt. Heat comes from the engine, via the coolant system. Inverse happens when you release cap, warm air escapes, rubber hoses push coolant back into reservoir. You overfill because when it self bleeds the coolant level will drop, but not that much. 5. You don’t want too much space or the system will never build pressure to protect from boiling. Check coolant level in coolant recovery container. Low coolant level. it could also be a radiator hose, a cracked overflow tank, a leak in the hose connecting the overflow tank to the radiator, just to name a few things. When cooling, air can penetrate through cracks found in the radiator or heater. ago. Shortly after install I had a slight pressure issue in my coolant system but was advised that it was normal. So would a big air bubble cause it to shoot out like it did and since most if You need to run your car on idle for about 30 minutes to an hour (depending on how much air has to be bled from the radiator), with your radiator cap off. Custom pinstriped Power Wheel. #1 · May 1, 2014. Here recently, I could top off my coolant reservoir, start the truck and 5 minutes later, The overflow would dump all the coolant out the overflow tube. If you want to go with air cooling Noctua is typically recommended as the top CPU air cooler. Reply. Moving the coolant by hand has kept the temp regulated for 4 days(I drive pretty far each day for work). 7L 2500, Straight flange 2nd gen, ARP 625, Thuren/Carli goodies. If you see coolant level drop, add more coolant with the engine running until it's topped off and staying full Mar 29, 2020 · Pressure in coolant system. Psia would be subject to atmospheric conditions. Overheating an engine runs a very high risk of physically and permanently warping the top half of the engine, known as the head. 2 has a Tech service bulletin regarding this issue. Mar 3, 2024 · A damaged or split radiator is a common cause of overheating and low coolant levels, and it is also responsible for the buildup of air in the cooling system. It’s better to do it than not. It is bad head casting leading to coolant (all be it a very tiny amount) leaking into the combustion chamber on initial start up . The job of the car’s cooling system is to allow the engine to quickly attain its maximum temperature, maintain that temperature during its use and release the excess heat into the air. The only time air can vent out with the cap on is when the cap opens. Order Air Intake Parts. The coolant pump has a seal which prevents coolant from leaking past the bearing. The S2000 has 2 coolant bleeding valves: One near the intake manifold on the front driver's side of your valve cover, and a heater core bleed valve located near the firewall. • 1 yr. . Aug 7, 2022 · Fully deleted and getting pressure into expansion tank causing antifreeze to move over and not come back. With high compression the engine works like a well. Feb 12, 2012 · Mar 19, 2013. Pulled over about 30 seconds onto a wide spot, checked coolant and found a coolant reservoir filled with oil. After filling, I started the engine to bleed the air out and waited until it got to operating temperature, but the bubbles kept coming up from the radiator even after 30 minutes. If it’s not low, don’t add any. But a Water Antifreeze mix will boil closer to 225°F. You need to do it, whether or not your AC is working is not relevant. truck was brought in for CEL being on. May 17, 2009 · off of the upper radiator hose that connects to the engine side, which contains the thermostats housing there is a brass reducer fitting that reduces it from that metal tube to a 3/8s line which appears to go into the bottom of the turbo and out then returns back down into the water pump area. It would be pressurized only when your fuel pump was running. The next possibility is the thermo getting stuck, but a bad thermo wouldn’t cause a CEL so that seems unlikely. Well ill be damned. Been 3-4yrs ago. Leading to a small amount of coolant loss over time. If dealing with an oil film, use a cleaning solution and water at low pressure. The valve should open when there is 25psi differential across it. Your edit is exactly how an at-home flush works. Just installed 2nd water pump replacement recently and now heater core is leaking. I would rather not have to pay for a repair that it doesn't When the engine warms up, the wax melts, expands and pushes the valve open, allowing coolant to flow through the radiator. Too many things to mention since but here's my issue with info I think may be important. 2 head gasket changes, fire ring and ARP 425 studs. There are two types cooling method in diesel engine, water cooling and air cooling, and at present, there are two kinds of engine water cooling system, one is the traditional belt engine water cooling system, the other is the electronic fan engine water cooling system. there is nothing else under the hood that can pump that much pressure into the cooling system. This causes a pressure release through the cap when the engine warms up then air intrusion through the cap when Dec 21, 2013 · The RPM would create the pressure, but I doubt this is the issue. 0L Diesel that we have done head gaskets and stud kits on. Nov 16, 2017. uhhhhhhhryxn • 2 yr. Just sludge in the coolant overflow. IF you have diesel in the coolant, you then have coolant in your diesel injectors which rusts them out. 1. You instead are supposed to use a machine that pulls a vacuum on the cooling system like this one but also pressurize the coolant holding tank and pushes coolant back into the truck through the bottom of But that is the easy part. Air in the cooling system won’t allow the coolant to pressurize properly which causes it to have a lower boiling point and will cause overheating issues. Thermostat failure: A malfunctioning thermostat may not regulate coolant flow properly, causing coolant loss and inefficient cooling system operation. Let it burp completely till it stops bubbling, Each time it burps, the air pocked is being purged and coolant takes up the volume that the air pocket took up in the cooling system and you'll noticed coolant level goes down. Internal combustion engines need clean air to work properly; otherwise, power and efficiency quickly decline. 06 F-250 x/c 4X4 sb 17" alloy wheels. If air is still present. It’s also possible that one of the radiator hose clamps (or other coolant hose clamps) aren’t tight and you’re slowly losing coolant that way. Fill and Bleed the Cooling System. Stuck thermostat, or complete blockage of the cooling system somewhere. 07. After that did the 30 miles back home coolant temps were normal and level stayed the same about 3/4 of the reservoir. Causing coolant system to be starved of coolant. A fuel-rich mixture will not burn completely and will leave the engine as soot, producing black smoke. 5 quarts of the volume drained. If it overheated the chance of a warped head are high too. Oct 10, 2012 · Its not showing up in the radiator when I remove the cap. Mar 9, 2023 · 3. 17 posts · Joined 2011. I just bought a venturi coolant refill system off the matco truck, i read the instructions and saw that it shouldnt be used on cooling systems with a max psi of 13psi or less, what is the normal operating pressure of a cummins x15 system? Off the top of my head it's 15psi, can't imagine it'd be lower than 13. May 3, 2004 · Therefore, it seems logical to me that the symptoms you noticed were the result of something else. Letting air out but not coolant (in most cases). Keep the radiator cap off, run the engine to where it gets hot enough to open the thermostat and cycle the coolant. Feb 17, 2012 · When there are fluid voids in the system cast iron sees O2 from the air and causes rust which washes off and causes the brown sludge. Nov 9, 2023 · If the cooling system in a diesel engine is not working properly, it can cause the engine to overheat. other tech stated it was over heating however it was pushing out coolant rather than boiling over. To maximize your diesel engine’s performance, keep the air intake system clean and well-maintained. Mar 13, 2010 · Head gaskets. Even if you gravity fill the system, you can use the vacuum filler to apply a vacuum to the cooling system and suck the air pockets out. Then the coolant is sucked back from the overflow tank refilling the void in the radiator. hi, i changed my air intake hose and i had to disconnect a coolant hose, some coolant spilled, i’m wondering if the air i introduced in the system might cause problem or my car should run just fine, pls help a learning mechanic, thanks everyone. Check the overflow tank for proper level every morning after a refill. If this seal fails then coolant can seep out where the coolant pump pulley shaft enters the pump housing. You could have to replace EIGHT injectors just to get to run right again. The water pump wouldn’t cause this. Remove dirt and debris from the radiator core area. As another user suggested, use a spill-free funnel that adapts to your radiator cap. The cooling system is designed with this in mind. If you discover that the level of your coolant is low, top it off and pay attention to the reservoir for a few days. still losing coolant. Water expands when it freezes, and if the water in an engine freezes it can burst the block or radiator. Fill to FULL line. When the engine stops and cools, the valve closes again. As coolant gets hot, it expands, and overflow tank allows it a place to go and also helps purge air out of the system, since the air will be pushed to the top of the radiator, when pressure increased enough, the spring loaded valve in the radiator cap will open and the pressure will push the air and excess coolant down the tube into the Hey there, So yesterday I was looking at my engine (my turbo hose came loose, I fixed it), and I noticed that my coolant level has dropped since the last time I had taken a look in early May. wrenchguy1980. Slowly loosen vent fitting (1) to purge any trapped air. But you'd see fuel floating on top if it's gotten high enough to reach the cap. I also inadvertently did a drain and fill. This engine coolant pump circulates the coolant through the cooling system. You can search and find “coolant flush” on YouTube, where a plethora of how-to videos are available. It may be evident with traces of car May 22, 2011 · Trucktool. The cap also is suppose to let air back into the system as it cools off. If that’s not available, then make sure you’re actually running the engine long enough to get the thermostat fully open. 7. They do fail with time. Can also cause the car to over heat as it will develop hot spots in the engine with air hitting what needs to be cooled instead of coolant. The cooling system in a diesel engine works by circulating coolant through the engine block and radiator. I have the DEEPCOOL El Captain 240 and absolutely love it. now that brass reducer also contains a thermostat syle check valve of some sort as well, and yes That can happen if the cooling system has recently been drained and re-filled. , tells a story that would strike fear into the heart of any fleet manager. This is the easiest problem to fix out of all the ones listed, as nothing actually needs to be repaired in this case. Once you have repaired the problem, you must refill the cooling system and bleed it. The volume of coolant added to the engine must be within 1. Extra fuel flow can be caused by several things, bad injector (s), stuck mechanical fuel rack, failed governor, bad turbo oil seals, etc. You don’t have the radiator cap on, so the system is not holding pressure. Not even the appearance of an oil slick with the rainbowie (yeah thats a word) colors. May 20, 2011 · Cracked injector cups will lead to fuel in coolant, but if you have cracked injector cups on a 6. Kiss of death for diesel injectors. Nov 19, 2020 · Cavitation starts with air bubbles degrading the protective oxide film on the cylinder wall. If it was a cracked injector cup, your coolant tank would be puking fuel out of the cap. Aug 1, 2020 · Bad Coolant Refill: It's possible that if you're refilling the coolant in the tank, or if you flushed it incorrectly as well, the air could have been trapped in the system that will need to be flushed out a second time. I’m not overheating, not blowing any white smoke/exhaust. The bubbles you noticed were the result of air in your cooling system after maintainance. 2013 Mk7 Golf 110TDI is pushing coolant out from the surge tank. Electrolysis Uses coolant to absorb heat from the engine in internal passages and allows to the coolant to flow out to a heat exchanger to transfer its heat energy and then return to the engine to absorb more heat. Nov 8, 2015 · So with coolant temp at 202F I opened the cap and a lot of coolant came out, if I had to guess about 4 gallons and with enough force to cover my hood. A failing/failed water pump will cause the same issue. The block could be cracked and there is no saving that. As for the heater core, the only way to tell is to do a flush. you fill it until coolant comes out of the bleed screw and there are no more bubbles coming with it, then you tighten the bleeder. Son of a bitch. But, since its an 01, you might want to have the resivior cap pressure-checked. Since there's not an external ignition source on a diesel, you have to either shut off fuel, or shut off air. I was topping up with coolant before and after every drive and it must have just been boiling off with an air bubble somewhere stopping it from circulating. One of the most common sources of coolant leaks is a bad water pump. Once you have filled your radiator with new coolant, add excess coolant up to 1/4 the Thanks for the reply! Sure, it could be the radiator. Over time, this seal dries out and leaks coolant from the pump housing. I noticed my coolant in the radiator was low recently but the reservoir was still at the correct level. Thank you for posting to AskMechanics, Relative_Form! Use the proper coolant. The cooling system is composed of various parts: the radiator, pressure cap, fan, pump, thermostat, hoses and overflow tank. You can check your radiator using an infra red thermometer. Nov 16, 2017 · Mk7 Golf 2. when you fill the system you need key on engine off, blower on min and heat max, with the bleeder screw cracked. Ensure proper airflow through the fins. Again another indication that it might be a hg. When the coolant level drops under the minimum required levels, due to leaks or water evaporation, the pump will suck air from the expansion tank. There should never be air inside the cooling system. truck did not reach 140 degress and was pushing All my bikes are oil cooled except my yamaha(air cooled) The cooling system is one of the only weak points in vintage bikes (old fuel is pretty bad too. If the cap is stuck, it will cause a collapsed hose when cool. Mechanics thinking it’s a bad EGR cooler. Cooler running systems and less noise. RickMN • 2 yr. It’s pushing coolant into the fuel return, and it’s getting returned to the tank and sucked back up, and caught by the separator filter. System maintenance. airgator said: I have a customers 01' IH4700 with a DT 466E that is building alot of coolant pressure. It's why you see the suggestion to crank the heat to prevent overheating; that sinks heat away from the engine. By sticking it in the coolant system you are effectively changing its atmospheric conditions. We bresth a corrosive gas and drink the most powerful solvent known which both of those things basically destroy everything else butvwe need it to livr sure bacteria in your engine coolant. Only do this when coolant temp is below boiling. Replenish as necessary till it stops burping. At zero on a cold start then slowly rises to half on the gauge after about 5 or 10 minutes of driving. I steer clear from water cooled bikes unless the cooling system is immaculate. It's a 10 psi system, so no leaks to be found there. I mean as humans we are extremophiles. Monday they tore the turbo side down, swapped the cooler and got it up and running, thendid a coolant flush. The latter method is more reliable, and usually easier to accomplish. It can take some time for all the air in the system to purge. still overflowing. Oct 16, 2010 · This means there's very little coolant circulation through the radiator; The coolant in the radiator isn't being warmed up. Last could be the temp sensor but it seems to behave normally. So they design in 6-12% expansion space in the tank. I don't think you have a head gasket problem. The most common causes of BMW coolant leaks include: Failed Water Pump. Separate system. Cummins x15 coolant pressure. run the engine to operating temp, let cool down all the way and fill the coolant as needed. Air pockets in the cooling system can definitely cause fluctuations in the dash gauge. 9. It's tough to detect diesel exhaust in the coolant with most testers. Rubbertutti. I suppose you could hot-wire the fuel pump and see if the coolant level rises. But you don't even know why the coolant is mixing. On initial fill, when there’s an air pocket under the T-stat, it’s not uncommon Apr 6, 2011 · The cooling system runs up to 15 lbs of pressure-- and should release any pressure over that. I've never heard or seen anyone in real life use distilled water. I don't see why not. Get one of those radiator no spill funnel kits and run it attached to the radiator filled with coolant. Also have eliminated the EGR cooler. #1. Head gaskets are a trouble-spot on the 01's, and CAP describes the symptoms of blown gaskets. Another reason for excess air in the system is caused by running the expansion tank level too high. If a t-stat is stuck shut, the coolant will overheat, creating excessive pressure, and coolant/pressure will be bled off to the overflow. Coolant expands as the engine goes from cold to hot and it needs somewhere to go. The boiling temp gets raised when water is under pressure. Dec 16, 2010 · Coolant maintenance prevents diesel downtime and costly repairs. Old coolant can corrode your cooling system, making it less efficient, wear your water pump and eat head gaskets. Looks like gases enter the jacket under load, accumulate and then rush up to expansion bottled causing it to overflow - overflow pipe is Reply. Sep 11, 2023 · The cooling system is a sealed pressurized system, so when you have a leak, it allows coolant to escape. It's impossible to have any idea where it's leaking for sure without being able to inspect it. The benefits of liquid cooling is pretty significant and completely worth it IMO. My friend has a 2005 6. Go for a 30min drive to get the engine up to temp and thermostat open, check the you are getting heat inside the cabin, check top and bottom radiator and hoses are hot then siphon the excess coolant out. This technician is taking a coolant sample from a radiator -- a very important part of any maintenance program. Apr 20, 2022 · Coolant pump seal leaking. Top up to radiator level after each burp. The problem with dexcool is very simple It rapidly turns acidic when exposed to the atmosphere. 3. The temperature change causes condensation to form on the coils which drips out of that hole onto the ground. It’s worth mentioning here that the front of the car was elevated for this step. Also why cranking the fan immediately when its cold only blows cold air. #2. Apr 19, 2015 · Let the engine cool down. Elizabeth Nelson, coolant program manager at Polaris Laboratories, a fluid-analysis company in Indianapolis, Ind. This has been analyzed by an independent shop and determined to NOT be combustion gases in the cooling system. I guess all the oil is just making its way to the top of the radiator and the pressure from the system is pushing it into the overflow. Air would still travel through the water pump. Check the exhaust for excessive white smoke, check the coolant for any sludge, look around for an external leak, recheck the oil by removing the oil filter, check the coolant offgasses by using an sniffer, check the interior floors for coolant. Apparently this is a common failure, so I took it off and examined it but it looks new, gaskets all seem fine, no cracks in the housing, and the coolant passage holds pressure if I block off one side and apply air pressure. By using the right coolant and following recommended Oct 9, 2012 · If all else fails, you could try jacking up the front of the car to elevate the radiator and then run the engine for a good 20 minutes or so (make sure you hit full temp) with the radiator cap off to let all air work out of the system. What happened on my mum's car is that the coolant goes from the engine through the oil cooler and the EGR cooler and then the heater core, the heater core was blocked which caused the EGR cooler to boil the coolant resulting in a burnt coolant smell, no heat in the cabin and a loss of coolant. 0 TDI. rx kl ng ru io go pu bu kq zo