2004 Chevrolet Avalanche

Heater problem
2004 Chevy Avalanche V8 Four Wheel Drive Automatic 100000 miles

no heat
Brian j decato
January 21, 2010.

Check the operation of the blend door on the passenger side below the glovebox. Verify the HVAC controller is sending commands to the blen door actuator. If the coolant level is correct, the thermostat opens and closes as it should, and the blend door works, the heater core could have debris. Does it have Dex-Cool that is older than 3 years in it?

Scotty Dee
Jan 26, 2010.