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i am working on the same problem at my 230 ce 1990 right now (w124). the first thing you have to check is the blower motor, and when you have got that out of the car, you see a panel, straight trough that panel there is a resistor, if thats not burned, you can check any wires going in and away from the resistor. in my case it is the panel to the heater that is broken. Good luck! :)
(my english is not the best because im Norwegian)
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Why wont your Heater Blower switch work in your 94 Sundance?
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