Thanks Weasel56. Yes that's correct, no fan at all whether I put it on auto or all the way up. I did change that resistor, but it didn't fix the problem. So I'm thinking it's either the relay or the blower motor. I hope I don't have to change the motor because I heard that it's very difficult. If you know which relays to check and where they're located, please let me know. Also, what is the aux fan?