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Blower fan does not come in both in cooling or heating mode. you can see the fan speed going up by pushing the speed control.does not come in both in auto or manuel
You may have a bad blower motor, check power and ground to the motor, if the signals are OK, then the motor is bad. If your not getting the proper signals to the motor, the control circuit needs to be tested to determine the fault.
Q&A > Mercedes-Benz > 1996 Mercedes-Benz C280