I drive a 1990 jeep cherokee. The other day I got in my car, and while driving the driverside window will restart my radio, the power gauge will dip while holding the switch, the ac stops blowing and continues after I let go, and everything will go back to normal once I let go of the switch. Now, while im at idle or park, the switch works fine with no problem. This started in a matter of 2 hours, while I was at the dentist. any help?

 

Ick. Sounds like maybe the wire to the motor is shorting, or maybe the motor it's self. Your voltage dropping when you hit the switch is why the radio and the blower quit. You might want to stay away from that switch until someone pulls that pannel and has a look at it. (I take it the others work?)

Wires tend to break where they go through to the door post. If there is a master switch somewhere there likely is leg going through there that could short.

That said, I don't have one and have never worked on a Jeep power window. Good luck!

 

sounds like a short to voltage...
when you hit the switch your draining volts somewhere. like above post stated, start with wires that go through door jamb. If possible pull wiring diagrams for power window, radio and blower motor circuit? see if they share a common circuit or component locations.