Show Less. For the record, I used to have high pressure in my coolant system that would leak out of the expansion tank occasionally - no oil in coolant, no coolant in oil, but it was a blown head gasket. But you measured a 0.4 liter drop of coolant in the reservoir which is too much. My heat came back and it was fine the rest of the winter. Do I put coolant in the radiator or reservoir? Have a certified technician, like one from YourMechanic, complete an... Hello. I have A 2001 duramax I am getting pressure in the coolant system but is not geting Hot I can turn it off and hear the pressure coming out of the overflow tube or when it is running I can see bubbles in the resvor about ever 3 sec what do you thank is causing the problem . I also have the full egr delete on my 1.9. Hello, what causes cooling system pressure build if driving quick? The overflow tank is located along the back firewall next to the air conditioner (condenser), and behind the air filter and over the windshield washer tank. Any issue that causes engine overheating should be addressed as soon as possible in order to prevent any possible damage to the engine. The degas pressure is almost totally from the heat of expansion, unless you have poor coolant circulation and have some boiling inside the engine at hot spots or you have head gasket leaks or an EGR cooler leak. If the pressure relief is on the radiator then pressure in the reservoir or more correctly called expansion chamber then tbe outlet of the chamber is blocked eg kinked hose etc. Just something to look at. Mr Lee did an awesome job, Pontiac Grand Prix - Vehicle Engine Cooling Inspection - Indianapolis, Indiana, Buick Regal - Spark Plugs - Glendale, Arizona, Very professional had all the right tools knew just how to roll the engine to get to the spark plugs and wires on the backside and the car is running great really would recommend if you are having problems with your car plus they come to you let you know when they are on the way it's great, Mini Cooper - Brake Pads Replacement (Front, Rear) - San Diego, California. Modern cars are equipped with a sensor inside the coolant reservoir. In my opinion, what you are observing is NOT NORMAL. This is not something to ignore, but it isn’t necessarily a difficult problem to fix either. This coolant flows through the overflow tube into the bottom of the overflow tank. It’s an ’01 Duramax with 75k on it with a new set of injectors just installed. Opening it hot can cause serious burns (very hot coolant can spray out). Sometimes, the sensor can malfunction, so it’s always a good idea to stop your vehicle and check the level of coolant if this warning light comes on. he was prompt, knowledgeable and courteous. 5+ Year Member. but i think i filled the reservoir tank too much. When the engine is cold, the pressure of the cooling system is low and more coolant is required, and when the engine is warm the pressure of the cooling system is increased and therefore less coolant is required. If the coolant reservoir has any issue that prevents it from properly holding coolant, or from properly pressurizing the system it may cause the engine to overheat. So, the radiator coolant overflow tank functions to serve this exact purpose. Hi all i've got a pretty big problem with my '98 v70 turbo, its got too much pressure on the cooling system, the hoses get rock hard after it heats up and when its hot or after shutting it off coolant squirts out the filler cap. Swapped the cap and had the same issues. Common signs include needing to constantly add coolant, finding coolant leaks, and the engine overheating. We put in a new thermostat and that didn't fix it, so we took it in and it was full of sludge so we had it flushed out. Small leaks may produce steam and drips, while larger leaks will produce streams and puddles, as well as an obvious coolant odor. I think you're making two erroneous assumptions. For some vehicles, the coolant reservoir is an integral part of the system, and since it is also pressurized, the coolant reservoir becomes an even more important component to engine safety. If the reservoir tank is too full, then it will overflow and spill onto the ground. Generally, when there is too much coolant in the reservoir tank, It gets expelled out through the overflow hose. The constant need to add coolant can also be caused by a leak somewhere else on the engine so a proper diagnosis is recommended. The statements expressed above are only for informational purposes and should be independently verified. It never ran too hot. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. Inverse happens when you release cap, warm air escapes, rubber hoses push coolant back into reservoir. Basic history of the car: I picked it up for $700 after the original owner thought it had a bad head gasket cause of milk in the oil, he paid $1200 for the HG only to see the oil again 1 month later. No water in oil or oil in water that I can detect. Use a towel is a great way to keep your hands from contacting any of the steam. If the thermostat is fine then it may have a... Get a fair & transparent quote instantly before booking. The best test is the combustion gas in the coolant. If the vehicle has its pressure relief on the reservoir then this can be normal. It is recommended that car owners keep extra coolant in their cars at all times. The coolant must be FULL in the radiator under the cap, and full up to the MARK on the side of the reservoir. document.write(new Date().getFullYear()) A coolant leak can come from leaking hoses, a bad head gasket, an intake gasket, or a number of possible locations. bubbles appearing in reservoir tank when idling. Shouldnt it release the pressure in the tank if its over 15 psi? In addition, the radiator, set beside the car engine, also heats up. Ford wants you to condem egr cooler or oil cooler. It sounds like you are losing coolant either because your cap is not holding enough pressure and letting too much coolant out or you are overheating due to a leak or bad headgasket which is why the level is always low in the radiator. Maybe modern systems don't work this way but I'm sure when expansion tanks first appeared that was the rationale. Our certified mobile mechanics perform over 600 services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. … Usually a bad or failing coolant reservoir will produce a few symptoms that can alert the driver that a problem has occurred and should be serviced. Pittsburgh, Pennsylvania. Modern cars are equipped with a sensor inside the coolant reservoir. You must have noticed that your cars hood becomes hot after it has been running for some time. Just had the same thing happen on my 93 LWB except the tank blew up instead of the cap letting the pressure out. For a better experience, please enable JavaScript in your browser before proceeding. Coolant tank is turning darkish with gummy residue in the walls Don't worry you won't really blow anything up unless you have a bad cap. As these fins spin, they pull fluid into the power steering system. Never overheats. Your coolant reservoir is marked with a max level to account for coolant expansion as it gets hot. Cap's pressure release system is to protect other components. I realize that the system pressure normally increases when the engine is hot, but this felt too high based on the firmness of the hose. If deltas are high oil cooler is replaced and egr cooler is pressure tested in water for air bubbles. Level stays pretty consistent. Aug 28, 2010 #1. nek Probationary Member. So with 15 lbs presure, and Dex-cool, the coolant will not boil until it reaches around 250 degrees. My coolant has behome highly pressurised causing it to leak through the cap. Step 1 - Check for a Broken or Defective Radiator Cap. The cap is usually the pressure regulator in a cooling system so this is odd. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. The cap is set to 15 psi in most cars and operates like a pressure release valve. - I have no coolant in oil, coolant is nice color, no overheating, and no white exhaust smoke - just way too much pressure in the coolant system - no I am not over filling it. Has anybody noticed pressure in the plastic jug coolant reservoir, even when the engine hasn’t been started for a few days? When the pressure is high enough, it gets released via the radiator cap to keep a regulated 13psi. LEARN MORE. Turns out I had mostly water in the radiator instead of coolant. This floating sensor will trigger a warning light on your dashboard if the level of coolant becomes too low. now i noticed little coolant spots on the top of my radiator which looks like little leaks coming out of the top. Very friendly and knowledgeable, and didn't try to nickle and dime me. 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