HI guys,
So I have been having this issue with this car for over a year now. I have replaced all the typical items for the cooling system, Radiator, thermostat, water pump, radiator cap, overflow bottle cap, flushed the cooling system, even disconnected the rear heat and looped the connection on the firewall,
The car runs fine when its cool but once it is summer temps outside in NY it will start to push coolant into the overflow even when its cooler out. But when the engine cools down it will not pull it back into the radiator. This will continue until the air in the system causes it to over heat. I have done a pressure test and it holds at 20 psi for 20 mins. I am thinking its a hose issue maybe I need to replace them all cuz one might have a small hole that is loosing vacuum. I am not sure. The car has 251k miles on it now so could it be the head gasket? Anyone out there have this issue or have seen it? Any ideas would help.
Thanks