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Old 07-03-2007, 07:26 PM
777stickman 777stickman is offline
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Re: Heater control valve

I have looked thru the '98 C/K Truck manual and can find nothing, other than a replacement guide, for the water bypass valve. Nothing on why it's there, what it does or what controls it. So???? Also the pic's you posted showing the temp door motor make it look like a real pain to get to. My '98 Sub isn't even close to what you're dealing with.

With all the grief you're going thru I would suggest replacing the switch module. Maybe with one out of a "pick-n-pull" just to see what happens. Sorry I can't be more help, but I'm stumped.
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