New to the forum here so try to bear with me...have a '97 Rodeo/Passport and the blower (vent, a/c, heat, etc.) crapped out on me a couple months ago. It started out only working in the #4 position but has since stopped even at that speed. I have been reading over past posts and it seems to be an issue with the resistor, relay or the switch. I had gotten a new motor and tested it by plugging it in and it still did not turn, thus why I'm thinking it's not a problem with the motor. Where exactly do I find these parts and how do I test them? Also, if it turns out one of these components is faulty, where would I look to find a replacement?

Okay, figured out it's just the resistor. So where do I find a replacement?? Any ideas?

I've usually found things like these are a dealer only item. Chances are your dealer would have to order it for you.. if that's the case you might want to give St. Charles Isuzu a call. They can mail it to you directly at prices that beat all other dealers (from my experience).

I checked other places on the net and couldn't find a part for you. I was having problems with my unit as well. It may be my control assembly. If you find a place better than the dealer for your part please respond back to this ... and I'll follow your lead!

great! any chance you can share how you diagnosed the problem? thanks

i found mine by trial and error. first i replaced the blown fuse and promptly blew it again. then i pulled the fan motor out and found it had seized up from frozen condensation in it. this seems to have burned out one of the circuits on the resistor. i completely disassembled the fan, lubed it and put it back together, not really too hard. course, the wife was ticked i did it on the kitchen table while she was putting out cookies to cool. apparently too many cookies diappeared while the (oops, off topic)when i pulled the resistor out, i could see one of the circuits was broken. it ran ok on all speeds except #3; but switching from 2 to 4 blew a fuse every time. i took the glove box out and that made the whol thing quite simple. yes it is dealer item only and yes st. charles is the place to go.