Hi on my smart 450 for two 2007 my heater blower stop working i check the wires and its a ok check the fuse its ok test the blower motor working perfect i change and speed resistor but again not start.
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Heater blower stop working.
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Sounds like the switch is faulty, it's not letting enough current pass down the cable. Using a meter you might see 12 volts on the cable, but if only one or two strands of the cable are actually connected, it can not pass enough current to turn the blower motor.
Trace the cables back from the blower motor and at each point where there is a junction try connecting the blower motor with nice new thick cables.
John
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