Moparkrazed

Hello, I'm new to this site and can't quite find anyone that has the same issue as me. I bought a 2003 Chevy trailblazer ext with the inline 6 4x4. My family loves the car and it's been a good car for us, the ac went out altogether the other day and the car ran like crap but after doing a lot of digging ran across a video that said the clean out the throttle body. Did that a few hours ago and the ac finalllllly works in the front and runs great. The problem now is in the rear, I found that if I pull the 30 amp fuse out of the blower motor and barely press it back in the blower motor will work on all speeds but if I push the fuse all the way in the blower will stop running. I figured maybe some kind of bad connection? Not really sure what to make of it. Any help would be much appreciated. Let me know if any other detail is needed, I've only had the car for about a year so still finding my around the car.