Sopmetime ago Bryan and Ross detailed an A/C/interior fan problem ... kepy cutting in and out. I have a '92 400e and just started experiencing what I think is the same problem. I can select EC, defrost or full on A/C and the fan will not function. If I leave any of the functions on the fan will suddenly start working normally again. I can then switch back and forth to low, high speed or auto. Then just as suddenly it will quit again. In the morning, upon initially starting the car all works fine ... then quits, then comes back on. Neither Bryan nor Ross ever posted a followup on what repair action resolved the problem.
I have checked all relevant fuses ... all are good.
As I am 2 weeks away from a Palm Springs golf outing any suggestions would be most appreciated.