what would cuase an 92 s10 to over heat when the heater is on but stay cool with out the heater running.

Asked by Dec 09, 2015 at 12:38 PM about the 1992 Chevrolet S-10 2-Door Regular Cab

Question type: Maintenance & Repair

my husband has a 92 s10. its low mileage and everything but recently been having issues. when he turns on the heat it starts to over heat but when he turns off the heat its  doesn't over heat.

1 Answer

20,715

That typically has the opposite effect. Is he turning it on defrost? That will kick on the ac compressor. Coolant is always flowing through the heater core no matter what position. All you change by moving the heater lever is a blend door behind the dash. If the ac is kicking on it cold be a bad fan clutch, partially clogged radiator, or numerous other cooling system problems

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