interior heater not heating

2004 OLDSMOBILE ALERO

140,000 MILES

DINGOEX

MEMBER
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 5:17 AM

WRENCHTECH

✓Experienced Mechanic
20,760 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 5:34 AM