Heater blowing cold air in my truck

Asked by GCinclev Feb 21, 2015 at 08:27 AM about the 2002 GMC Sierra 1500HD 4 Dr SLE Crew Cab SB HD

Question type: Maintenance & Repair

One heater hose hot, one not

2 Answers
55,990

TransAm77 answered 9 years ago

Check your coolant level first. If the radiator and overflow bucket are ok then its probably a bad thermostat, water pump or plugged heater core. Start with the thermostat its the most common problem.

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