Problem Description and Possible Solution
The climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly required to correct this problem.
Average mileage: 165,000 (165,000–165,000)
1 model year affected: 1993
2 people reported this problem
I have a Dec 1992 400sel. Had a problem where the car just would start intermittently but the climate control also stopped working. Took to couple of workshops and replaced blower motor etc. Nothing helped. One auto electrician suggested a good squirt of contact cleaner in the ignition key hole.
Inserted the plastic feeder tube about half way into the ignition key aperture. Couple of seconds of good squirt. Had to wait about 12 hours (overnight) and everything has worked like a dream since (last 12 months).
The car now starts every time and the climate console has completely revived as well.
Hope it helps. Best car I have ever owned.