2002 Chevrolet Avalanche 1500 Q&A

2002 Chevrolet Avalanche 1500 Question: I'm having trouble with the heater. It blows cool air.

I can only get cool air whin I turn my heat all the way to hot, and turn the blower on. I know that it changes when I change it from dash to floor to defrost and so on but just cool air. Can you help me -
Answer 1
Check to make sure that your coolant level is full and your engine reaches full operating temperature. How old is the thermostat? It probably needs replacing. -
Answer 2
The 'mode control motor is responsible for defrost, vent and floorselections. The 'blend door' actuator , or control motor is for temperature , along with a heater control valve. Maybe check those, along with coolant and proper engine temp. -