heater blower motor on 1990 Mercedes-Benz 300SL

I installed a heater blower motor in my 300sl. And the motor only blows on the lower speed. When i first installed it the motor blew on all speeds. After five minutes in only blows on the first speed..

by in Tucson, AZ on June 06, 2010
1 answer 1 comment
ANSWER by on June 06, 2010
There is a blower motor speed module that controls the speed of the blower motor , I would inspect that. The wires from the blower motor get power and ground from that component.
COMMENT by on January 04, 2011
where is the blower motor on the 3oosl located?
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...han a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

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