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: 88,000 (40,000–111,000)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
11 people reported this problem
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problem details
1995 Mercedes-Benz S320 100,000 mi,
the blower wasnot blowing air on hi speeds so had to replace the relay
1998 Mercedes-Benz S320 101,000 mi,
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.
1997 Mercedes-Benz S320 111,000 mi,
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.