I have a 99 jeep Cherokee
I was driving one day and had the AC on, all of a sudden it quit working and now only number 4 fan works. Any suggestions????

 

Blower quit working? There are writeups I think if you search for blower relay resistor or something like that. They are relatively expensive to replace but only a couple bucks if you have a soldering iron.

 

If it only blow on high no matter where you set it, More then likely you blower motor resistor went out. It is located passenger side under the dash just behind the glove box. It is a very simple fix. You just need to poke you hear under the dash remove a small plastic cover IIRC the cover is held with 4 screws. the resistor is right the. It is held with 2 screws. Just unplug it and plug a new one in and you should be working after that. BTW, You can pick up the resistor at any auto parts store.

 

What this guy said^
It's been so long since I fixed mine I forgot what it's called

 

Thanks guys, I will try that and see if it works