my sons nissan just did this.the plug that goes to the fan was starting to burn on the terminal ends so i got a set of spade terminals and soldered them to the wires after i cut the plug off.still wouldnt turn on the a/c compressor except in 4th(high) position so i replaced the fan motor switch(which was fried so bad i had to break it off the plug in pieces)it works like a bandit in all 4 speeds now.hope that helps.