You can get parts much cheaper at http://www.rockauto.com or http://wwwgmpartsdirect.com. Having said that, I agree with mtflight. When mine went out on a '97 Deville, everything seemed to point to the ACM. I went with my instink as the ACM is pretty reliable. It was the blower. Both parts are expensive but the ACM is much more so. Better be sure.