Got my Truck Last Night!

There is a TSB (Tech Service Bulletin) out on these truck's climate control system problem. I got a letter in the mail about mine back in 2010. I forgot what exactly goes wrong with them (corroded connections over time I think), but Chevy knows about the issues and has a fix for it. I would call a dealer and see if you can have it checked out per the TSB. Many of these fixes are covered under warranty even if the truck's factory warranty has expired.

The gauge cluster problems are caused by plastic drive gears in the stepper motors. As the gears wear, they jam and release at random, causing the needles to go crazy. On my 2004 Siverado, the cluster lasted about 85K. I had a mobile repair guy come out and rebuild it right in the parking lot at work. Never had a problem since. The new stepper motors have metal gears, so no more sticking.

my speedo is going out right at abou 85k. Ill be running 65 70 mph and itll say im running 45 at times. other times itll work great.