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Originally Posted by William  I flushed the cooling system and went through all the procedures listed above. My heat is so hot it will run you out of the car. My problem starts on day 2. After the car sits overnight there is tons of pressure built up. Car is hesistant to start. Remove bleed screw and cap. Pressure is relieved and car starts right up. Not quite sure what is going on, and I know I may have left out some details, but I need some direction. |
The radiator cap is supposed to have a built-in relief @ a certain pressure. I think it was 15-19psi, but don't quote me on that. I can't remember what it is off the top of my head, but excessive pressure is bad. It sounds like your expansion tank is not relieving itself, you should make sure you have the correct radiator cap. Might also be a good idea to do a cylinder leakdown test as cooling system overpressurization can be caused by a minor head gasket leak.