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Re: 2003 GMC SIERRA 2500HD AC INOP
Posted to HVAC Forum on 8/5/2007 1 Reply

Hi Eric,

OK, couple things: what motor? Manual or automatic air?

The B0229 and B3770 are door position codes, actuators bad or confused. These should not stop the clutch from coming on. Should be stored in the AC, not the BCM.

Your U1009 is a "nonsense"... Login to read more.

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