On my 1991 300E, the A/C, Heat, vents, etc. all work - what doesn't is the fan in any speed (Auto, High, Low) on a consistant basis. I've gone full days without the fan working. If I have the temperature set so that the A/C should be on I do feel cold air from the vents just without and fan blowing it out. Other days after driving for differant amounts of time the fan will suddenly start to work and I can then change it to any of the optional speeds. Any hints about where to look for a fix would be greatly appreciated. Gets fairly sticky this time of year in North Carolina and it's only going to get worse.

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1996 S320