I have a 1985 Pontiac Fiero with a 2.5L 4cyl. engine with an auto transmission that is overheating after being driven for a while. The coolant is being blown out of the reservoir tank and is not being pulled back into the radiator.
It does this with or without the thermostat in it. The cooling system has been flushed, new water pump installed and a new radiator cap and thermostat housing cap installed. Also have noticed that after being driven, the pressure in the system does not bleed off and will not pull any coolant back into the system from the overflow tank.
I have “burped” the system several times from both the radiator and the thermostat caps. Any suggestions?
Hey there Chuck
I HIGHLY suspect you have a restriction in the bottom of the radiator caused by rust or calcium build up, and you need a new radiator. Install a new thermostat once you replace the radiator.