NO HEAT

2001 GMC Sonoma

Tiny

mfowler82

October, 6, 2010 AT 5:57 PM

Heater problem
2001 GMC Sonoma 6 cyl Four Wheel Drive Automatic 120000 miles

How hard is it to repair.

FOUND 4982 RELATED QUESTIONS

No Heat

37 ANSWERS
5 IMAGES

1 Answer

Tiny

Wrenchtech

October, 6, 2010 AT 6:08 PM

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.

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