2005 GMC Truck ac blows hot air after changing alternator

2005 GMC TRUCK
85,000 MILES • V8 • 2WD • AUTOMATIC
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TCKON
  • MEMBER
  • 1 POST
I changed my alternator yesterday, after reconnecting the neg battery post and starting the truck, the climate control read 74deg with the air conditioner in auto mode, the air was cold for 20sec then started blowing hot air. I heard that this could be related to the computer needing to be reset, and I could do this by disconnecting the neg battery post and letting the computer discharge. Tried this a couple of times and still no results.

Looking for any suggestions or help.
Aug 23, 2009 at 4:17 AM
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MICKEY-D
  • ✓Experienced Mechanic
  • 304 POSTS
Generally, you want to remove the "positive"cable, not the neg. I think you should check the routing of the belt, or belts you removed. You could have missed the compressor, or are turning it backwards.
Dec 31, 2009 at 3:13 PM
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