acc question
 

Hello everyone -
I am a new member and a new owner (the 3rd) of a 1990 300sel with 315,000 miles on it. It has been pretty well maintained and is in good condition. I have a question on the acc. It works fine when I start up and drive. If I stop after 10 -15 minutes (for instance to fill up) the ac blows hot air when I restart. It will continue to blow hot air on subsequent restarts unless the car sets long enough to completely cool down (4-5 hours). It seems ok if I drive an hour or so and then stop and restart. It only happens on short trips.
Thanks for the information and knowledge available at this site. I have already learned a lot from the archives but have not seen this problem.
Thanks again-
Ken

your belt and or tensioner is loose.the speed sensor in the compressor is kicking out the clutch.when you start the car hot make sure that the a/c is turned off completely,let the idle stabilise and then start the a/c.it should come on.

Turning off the ac on restarts then turning it on doesn't seem to help. still sometimes blows hot. How do I check the air gap or for an oil film on the clutch? Can it be done without disassembly?
Thanks,
Ken

Charge up the system, freon leaks out.

System was checked and topped off 2 weeks ago. My indy could find no leak.