My 123 started blowing warm air. It was the control panel. Put a new one in, and it was amazing. It was blowing the hottest air I had ever experienced. Thought I would DIE on the trip to pick up the control unit. I would check that first. Just my opinion...
88 BMW E32 735i (make it go away)
95 Volvo 960 "Inga" (valve problems)
95 Nissan Maxima (the indestructible)
89 Ford Ranger XLT (ugliest truck in the South)