Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor on Mercedes-Benz S320

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

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Average mileage: 105,400 (40,000–175,000)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
12 people reported this problem
4 people shared problem details
the blower wasnot blowing air on hi speeds so had to replace the relay
Blower speeds increase from 1 thru 4 after that the blower diaplay indicates speeds 5, 6, and 7 but the actual fan speed does increase.
As soon as my check engine light went on blower motor doesn't stop blowing air
When turning on A/C, nothing happens, no fan, nothing. S320. Want to purchased car for son but don't know if this is just the evaporator fan relay or bigger issue.
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