I recently replaced my battery on my 04 tahoe. Once I had connected the new battery my driver side and backseats were all working correctly but my passenger side was blowing hot air. The next day my a/c was working correctly everywhere and I have no problems with my a/c for about 3 weeks. Recently you could smell a odor as if something had burnt but everything was working correctly. Today while driving the same strong odor appeared and the driver and passenger side stop blowing air period but the back seats is still working correclty. Any help and ideas will be greatly appreciated.

 

Welcome to the forum.

Does the front fan run on the highest speed?

 

Nope the front fan doesn't blow at all. I tried switching the settings from feet to defrost and back to normal and also tried moving the speed from low to high and still no air.