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Driver's side Automatic Heating does not blow hot air? on 1993 Mercedes-Benz 500SEC

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The driver's side auto heating function does not blow hot air. The passenger side works fine. The Air Conditioning works fine on both sides of the car when using the automatic setting.
(1) Answer
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Vehicle needs to be scanned to determine if there are any fault codes. There are two separate temp sensors on the heat exchanger and the cabin temp sensor. Also need to check HAVOC control module. No tech bulletins regarding HVAC. Milt's is close by. Call Adrian for an appointment.
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