2002 chevy tahoe blown ignition fuse?

My A/C kicks on after about an hour driving. If I'm lucky, sometimes it will kick on before that. Sometimes it works right away. Some days it doesn't work at all. Oh let me clarify...it blows air just fine, just hot air, and then finally the cold air comes through. My heat works just fine. ...

My A/C was working intermittently until I had a new battery put in yesterday, now all it does is blow hot air. By the way, I noticed that the condenser is cold.

Its a 2001, Pontiac, Grand am, v-6 3.4. With the key in the on position there is no power to the ign mod, f/p inj, and pcm ing., so naturally its no start. I'm not sure of the circuit , the wire diagram is a little help, any suggestions? Frustrated

Does anyone know how to reset the change oil light on a 2002 tahoe? We bought the truck used and do not have a users manual. Thanks

I have a '95 GMC Suburban. It blew the 30 amp ignition control fuse. I swapped a 40 amp spare I had w/ same result. No idiot light in the instrument cluster show up until a new fuse is inserted. There was no warning of any pending trouble. It ran great. It has a new starter, alt, battery...