My 1987 300 TD has a new problem. The fan for the climate control system works just some of the time. Recently I have tried to use the AC system, and the fan will not work in either low, auto or high-speed mode. Then when I go to park the car, the fan mysteriously begins to operate. At other times, the fan works fine.

Because, back in the winter, I got some funky performance from the defrost setting (fan would not come on but if I would jiggle the button for the defrost, it would) I am suspicious of the pushbutton control unit. Ideas about what else could be causing these problems?

Try cranking the car and if the fan doesn't come on turn the key back a littttttle bit. Not enough to turn off the engine. If the fan comes on the electircal portion of the ignition swich is faulty..I have seen this many times.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
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