I have a 2001 Oldsmobile Silhouette Premier and have recently discovered
that the rear HVAC blows hot air when the AC is activated. The front has
cold air coming from the vents, but the back has hot air blowing. The
temperature of the air is always hot, even though I have tried adjusting the
temperature setting using both the front and rear controls. The fluid lines
under the van are hot (engine coolant) and cold (AC refrigerant), so it
seems as if the problem is just in the HVAC unit. Maybe it is just the
damper. I have yet to open up the side trim panel to see what I can see. Is
there anyone that has had this problem and can help?

Thanks in advance.

Todd