Thanks for the wonderful forum!
I have a 1985 300 Turbo Diesel with 100,000 miles on the o/d. But my silver blue sedan has trouble in hot weather. The compressor clicks on, the system is charged (1st owner changed to R1-2-3, or whatever), but all I get is very hot air. I changed the in-dash temp sensor because it was cheap, then tried the ccu, and, as you all know, that was not cheap! But I still have hot air. I'm wondering what to try next. I've read many posts, but I'm not sure which part of the car to take apart next. I don't know if this is related, but the vacuum on the doorlocks is occasionally very slow. An overall vacuum problem?

I'm a semi-novice mechanic, having replaced the radio, fixed door locks, window switches, power antennae, water pump, odometer, brakes, etc. But I love success with my car projects, so now I'm hot and depressed. I'm looking forward to your ideas.