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2002 gmc heater not working

Double D racing

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The first thing you need to Ck. is the heater core it may be pluged. Pull heater hoses off run air or water to if it flows. Need to know if it is auto air or manuel air. Auto air has a air temperature actuator you have to pull the dash to replace it. The manule has a cable by the gas pedal. hope this helps.

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