What would cause temp. gauge to go to hot and heater starts blowing cold then goes back to normal and starts blowin warm again?

Asked by Feb 19, 2015 at 09:50 AM about the 1993 GMC Sierra 1500 K1500 SLE 4WD Extended Cab SB

Question type: Maintenance & Repair

I have replaced the thermostat and it didn't solve the problem

1 Answer

5

water pump could be going bad or the heater core is getting clogged up. when was the last time you flushed out the ccoolant

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