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What is causing your 90 Corsica to overheat only when idling When driving along temp will drop but when stopped at a light the temp gauge rises again?
Wiki User
∙ 12y ago
Defective cooling fan or thermal switch.
(NEW ANSWER) First check and make sure you have enough coolant in the radiator....normally about two gallons...nothing less(when the radiator is empty).....if you check your coolant level and it is low....add coolant...not water!!!....if it still overheats when sitting, either your thermostat is not opening when at the set temperature....in which case you will have to replace the thermostat....or the cooling fan isn't comming on at the set temperature in which case you will have to replace either the fan switch or fan relay. If you suspect the cooling fan, replace the fan switch first and fan relay last. But if the corrisca is overheating and the cooling fan is comming...then you can rule out the cooling fan and look towards the thermostat being the problem.
Wiki User
∙ 12y ago
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