interior heater not heating

2004 OLDSMOBILE ALERO
140,000 MILES
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DINGOEX
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  • 2 POSTS
Interior heater not heating, fan is blowing ac works. Suspect coolant temperature control valve not working. Don't know if heater has a separate fuse, doesn't show one on the fuse box legend. I looked for tempter control valve along heater hoses lost them in bottom of dash.
Aug 15, 2013 at 12:17 PM
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WRENCHTECH
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  • 20,761 POSTS
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 they are both hot, 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.
Aug 15, 2013 at 12:34 PM
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DINGOEX
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This actuator and door are behind dash I would guess.
Aug 15, 2013 at 1:28 PM
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WRENCHTECH
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  • 20,761 POSTS
You guessed right.
Aug 15, 2013 at 1:53 PM