Question about Toyota 4Runner
I was told my coolant system was holding pressure from a Toyota dealership, 2 days later my radiator cracked. does that have anything to do with that? and what would cause the pressure in the coolant system?
Holding pressure is a good thing. When it doesn't hold pressure worry. The cooling system Is a close system and when the coolant gets hot it actually expands creating pressure. Once it reaches a certain temperature the thermostat opens allowing hot coolant back into the radiator to cool and if there is to much pressure in the radiator a valve on the cap allows the coolant into the reservoir. When hot there's pressure which is why you should never open a cooling system when hot.
Posted on Apr 18, 2014
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Posted on Jan 02, 2017
Found hints on VolkswagenTalk.com suggesting to check inside engine oil cap. If you find foam (some call it ice-cream) Cylinder head gasket is blown. Went checked, and actually found ice-cream on it. Credit to Hillbill, Man you Rock!
I am now doing pressure test, but no wapping has been detected..problem was just in its early stages. on my way to get a metal gasket, and replace. Cheerz!
Posted on Jun 16, 2008
SOURCE: Oil leaking into coolant system
pull your spark plugs and see if coolant is inside the cylinder. If so you have a blown head gasket. also you can start the car (make sure its cold) and then pop the cap off of the radiator if it shots like a fountain then you have a blown head gasket (watch out though, does this due to a blow off of pressure into the coolant system). you might also think about replacing the water pump if you have a blown head gasket. Since you have it open it's not a bad idea, it could be the reason why the gasket is blown if that's the case.
Posted on Oct 16, 2008
You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.
Posted on Oct 30, 2008
The Problem, My friend, is a leaking oil cooler. this item is mounted, inside the engine, under the intake manifold. The cooler or the connections are bad. Coolant flows through the cooler, if it brakes then the oil will contaminate your coolant and make a mess.!! Have it checked. Must times is the seals at the pipe to cooler flange connector. will need new seals.. Hope this helps.
Posted on Jan 16, 2009
have you had the undercarriage inspected for white stains from coolant, rust stains if your system is corroded? How many miles? has the water pump ever been replaced, that would be my guess, water pumps leak while the eng is running and the hot engine evaporates the coolant, so in many cases none on the ground. Also have the system pressure tested by a shop and put on a rack to check for signs of leaking under the car.
Posted on Aug 25, 2009
Testimonial: "Thank you for your answer. I have not changed the water pump since I bought the car 5 yrs ago. I will check that."
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