Question about 2003 Chevrolet Malibu
Have replaced head and intake gaskets, thermostat....it was overheating but when idling got great heat but when driven would overheat so replaced thermostat sensor which fixed the overheating but now we get no heat???any ideas??
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Posted on Jan 02, 2017
if you do not turn the a/c on, do the fans cycle? turning on the a/c will signal fan demand - this indicates the the fan and circuits are OK. if the fan cycles with the a/c off, we can move away from a fan issue. if not, look into that. have you tested the rad cap? i believe this model has one cap on the expansion tank and no rad cap, if i remember correctly. i have actually run into one of these cars where an incorrect cap was installed, causing similar symptoms. it sounds as if you know what you are doing, but is there any possibility that there is an air lock in the cooling system? if there is heat coming out of the vents when the car is hot, there is probably no issue there, and also likely means the waterpump is ok. let me know and we'll talk later if necessary, good luck!
Posted on Apr 02, 2010
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