Just changed my serpentine belt. Every thing ran fine for bout 15 min then it the blower stopped blowing cold air out. It was still cold to the vent just wasnt getting blown. So I changed the fuse on the blower and it started working fine again, but now it blows cold for a min or two then blows warm. Any ideas would be helpful.

check to see if dryer is cold and sweating water.Then check vac line to see if one leaking. And has vactum to operatrate vactum valve. cold and heat mixing valve not working.

Are you 100% sure the belt is on there properly?

It almost sounds like something (compressor) is running in reverse.

Its weird the A/C started doing crazy things after you changed the belt.

Go back to what you changed and work from there.