Our 2002 K1500 Suburban only puts out heat when it is accelerating. The rest of time it blows cold air. What could be wrong?

Asked by Nov 19, 2012 at 11:41 AM about the 2002 Chevrolet Suburban 1500 LT 4WD

Question type: Maintenance & Repair

2 Answers

100,675

Probably cause would be the water pump. The impeller wears out over time and it's not pumping enough coolant through the heater core at idle. At higher RPM's, more coolant flows. If you ever used any of the stop leak products, it could be that the heater core is clogged.

215

Check that your coolant is at the proper level as well, if it is low it may only pump enough during acceleration.

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