In a message dated 3/10/01 7:24:23 PM Eastern Standard Time, mrvideosawyer@xxxx writes: << Well I got in the car today and noticed a hissing sound behind the heater/AC panel. >> Sounds like the Mode switch either has to be rebuilt or replaced. I remember seeing somewhere that Rob Grady sells the mode switch diaphragm to help rebuild it. Its a part of this "HRC Series Parts", give him a call (1-800-589-6224 or 631-589-6224 ) and see what he can do. Later, Nick 1852 <A HREF="Http://members.aol.com/njp548">Http://members.aol.com/njp548</A>