Good morning!
Hope you can help.

I've got a 1991 300E with 175K on it. Love it!
Recently my a/c stopped working.
When it stopped, I had just filled up with gas. The a/c was working before the fillup but stopped upon restart. I noticed the air circulation function also stopped working when the a/c stopped. Hot air is blowing out of the windshield defrost vents with no way of turning it off or decreasing the amount of airflow. All the climate control buttons did not work. It was like this all day.
Upon restart the next day, everything was working fine. Later that day it just stopped again.
This has been the pattern for the last week. Currently it hasn't worked in 3 days.
Help!

Nick