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Print in friendly format Send this term to a friend  Regular Production Order
Commonly known as RPO. These are the codes that GM uses to identify options.

For example, LT1 is the RPO for the engine used from 1992-1996.

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Re: Climate Control Damper is stuck in defrost mode

Subject: Re: Climate Control Damper is stuck in defrost mode
by Fredbird on 2011/6/28 15:26:15

Found the hvac processor and will check for vac at that point. If I find I have none at that point... I may need help finding where the source vac line enters the cabin. I found and replaced the check valve, and I did have vac there... But it may be broken further down the line.
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