Mechanics

HEATER

2004 Pontiac Vibe • 4 cylinder 2WD Automatic • 230,000 miles

2004 pont. Vibe. Engine heats up fine, blows hot through the heater, about 15 mins. Blows cool air through the heater. Turn off 10 mins blows hot again. Then cool?
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Wienerdg
November 26, 2010.



With the engine at full operating temp and the problem being present, 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.

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.

Wrenchtech
Nov 26, 2010.