Ok, i am familiar with the "service 4wd" message. I replaced the switch but now have the problem again. THIS TIME, when the lights are not lit up and have the message, one part of my truck blows HEAT when set on 6[/B]0! I have never seen nor heard of this happening. the first time it did, the driver had a/c and the passenger had heat... now its switched...

I have NO CLUE on how to even attempt to fix this without spending my life's savings at the dealership!

ANY, and i mean ANY HELP WILL BE APPRECIATED!