Hi,my car is overheating but only when my radiator
cap is on I found out when I changed the
thermostat I also changed valve cover and gasket
along with pcp valve and oil
could just be air in the system. best way to get it out is to take radiator cap off, turn car on and set heater to full blast while making sure coolant is full. keep running till it hits operating temp. then make sure its full and put cap back on. also, theres been times that i baught a bad thermostat which could cause this. when buying thermastat dont be cheap. get a good one. you get what you pay for. they sell differnt kinds that open at differnt temps. buy the one that opens the soonest.
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