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Re: 1988 k2500 defrost problem
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From the dash level (I removed the cubby next to the glove box) I can see the dash vent door open and close.
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That is the actuator for the temperature. Not the problem!
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Is there a third door I can't see? Thanks!
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Yes, the fresh air intake AKA max AC door. Not the problem!
Do as mike said.
There is more then one door being moved by that actuator next to the gas pedal. Study it as it moves.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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