TheRealItalianStallion
New member
- Oct 13, 2010
- 2
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he heater in my 2000 GMC Sierra is blowing cold? I flushed the heater core with a garden hose awhile ago when it first started and it flowed out fine no debris or anything came out even blew it out with some compressed air. That did not help so I replaced the thermostat which also didnt help. I dont smell anti freeze inside the cab and my coolant is full and just had the radiator flushed around 140000 now I am at 183000, i have reset the calibration on the doors in the heater box and they are functioning correctly I believe.. Any ideas on what it could be?