SJP1037

Good afternoon,

I tried to search google, and search in the forum search but came up with nothing. Here is my problem, my truck is a 2008 Silverado Crew Cab 5.3 with the dual zone a/c, today I started the truck (hadn't been started in 12 hours) and the automatic a/c comes on to cool the truck. about 5 seconds later I notice the a/c is not blowing but is on. The temp is set a 70 on both sides. I try to manually turn up the fan speed but nothing happens, the controller indicates the fan speed is going faster but I cant hear of feel it. I checked the fuses under the hood and everything related to a/c is good. I check the compressor on the passenger side and its cold with condensation. If I change the temp from 60-90 nothing changes in the cab.

Any ideas?

Thanks

tech2

so the problem is...
-can't control the blower motor fan speed
-no temp change when the temp is adjusted cold or hot

SJP1037

tech2

the hvac module controls all those functions. It has full diagnostic capabilities. have the hvac module checked for fault codes. this will require a full function scan tool that can access body codes. code reader will not cut it.