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Heater comes on while driving
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garysager
New User
Aug 7, 2009, 12:37 AM
Post #1 of 2
(1226 views)
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Heater comes on while driving
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I drive a 2004 GMC Sierra 1500 with 92,000miles on it. The heater comes on while driving even if the AC is on. I have to turn the engine off and restart the engine in order to get the heater to turn off. What can be the problem?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 7, 2009, 1:20 AM
Post #2 of 2
(1223 views)
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Re: Heater comes on while driving
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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.
In this case you could also have a problem with the control head that6 sends all the commands to the actuator.
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