Re: heater control gone awry

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Posted by Marty ( on 00:54:19 02/28/14

In Reply to: Re: heater control gone awry posted by Louie65

The link is very helpful.

The control on my '03 Tahoe has been wacky for several years. I haven't even tried to trouble-shoot it because the symptoms are transient. One day it works, and the next it will not work. Or, hour to hour. When it does not work, I can often turn off the ignition for 10 seconds, restart, and the controls resume normal function.

I have always wondered about the 'auto' function and whether it is receiving accurate feedback from the temperature sensors.

A few years back, I had the dealer replace a servo but the symptoms returned after 8 months. Some days you can hear every blend door clap; even the rear unit.

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