concord a/c fan speeds

97 concord lx with auto a/c. theres only one fan speed [low] in either a/c, heat auto or manual.no control change affects the fan it runs in low only. a/c works fine.

You could have a code on the body computer. Have it scanner at a autozone. If not you could have a bad head unit. They tend to go bad over time.

I agree with Bizzy102, it's been my experience with Chryslers (since I work with them everyday) that you have a bad ATC head unit. They aren't cheap, let me tell you, your best bet, if you can find one, go to a junkyard and replace it, you'll spend around $150 to $200 instead of three times that at a dealer.