2001 Gmc Sonoma Heater Blowing Cold Air Replaced Radiator Thermostat Still

2001 GMC SONOMA
99,000 MILES
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Heater blowing cold air. Replaced radiator and thermostat but still cold. What could it be?
Feb 9, 2013 at 10:55 PM
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ASEMASTER6371
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  • ASE Certified Mechanic
clogged heater core, blend door issue in the heater case or blown head gasket from overheating

Roy
Feb 9, 2013 at 10:59 PM
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