It was operating at upper normal temp before it was changed, but the car had high mileage and the old thermostat was worn with disintegrating seals. Checked fan, works; checked coolant, full (recently flushed, no sludge); fresh oil change. Let me remind you that the temp was in the upper normal range before the thermostat was changed. Any remedies for the overheating after replacing the thermostat, with no overheating before?|||HI
not saying you did but a mistake some folks have done is
1) put the thermostat in upsidedown. it should point away from the motor (up or out or what ever).
2) not add enough coolant to the radiator (not the overflow tank).. fill the radiator its self when the motor is cold it should be full or no more than 1%26quot; below the top.
3) there may be an air block so run it to tempature turn it off let it cool and recheck the coolant level again.
good luck
tim|||you most likely got air pockets in the cooling system and will have to bleed the cooling system to remove air. air is not nearly as good a heat conductor as water/coolant so it will overheat.|||I would say that you got a air bubble in the coolant system,this happens a lot after the coolant system has been opened. You should have a bleeder valve on are near the thermostat that you can loosen up to bleed the air out,the bleeder looks like a grease fitting.The air bubble gets into the water pump ,causing it not to pump water ,so the engine over heats.|||Pedal to the metal has given a pretty through answer.One other thing,sometimes new thermostats are defective.You can check to see if it is working (opening and closing) by placing it on a hot stove eye,when it gets to it%26#039;s operating temp.,you will hear it click or %26quot;pop%26quot; when it opens.Also is the new one the same temp range as the one recommended for your auto?
