Dash AC and Heat Control problem

[Damon92]

I have a 32' 1992 Damon Challenger DP that I am slowly restoring. I had a new dash AC system put in back in the summer. A few days later, my controls started acting up (only working on "max cool" on highest fan setting.) Ultimatley it stopped working altogether. So, I replaced the relay under the dash and it worked a few more days until it stopped again. I have replaced the relays once again but now it does nothing at all. The fuses are all good. It is a mystery to me and doesn't make good sense. Is it probable the control panel itself is bad? Im not sure what kind it is only that it looks simular to a Chevy Caprice my dad used to have. Any input is appreciated.
Merry Christmas!
Brandon

[Alan24601]

There is a large ceramic resistor that controls the fan speed located near the blower. That is your problem. Please don't ask how I know.

[Damon92]

Thank you! I will check that first.