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Q: 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..
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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.
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