1998 Pontiac sunfire sedan 2.0 heater's not working and engine perodically overheats?

smashpunk68

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My friend's car had the thermostat replaced and its been replaced every 3 months which is odd. A new head gasket, and a new radiator. As for the heater breaking down, is it the heater core? Is that the reason it could be overheatting the engine?
 
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