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06 note sve the heater fan started to run at slow speed only on all settings for about 3 weeks, it then started to work ok. it has now stopped completley. i have removed the resistor card and removed the cover, but cannot see any sign of wear on the pcb as the resistor card has only four wires where do i test for voltage and is it possible to temporary bridge the connentor to see if the supply goes from the cspeed control to the heater fan. hope someone can help
 

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Hi, from what is on the diagram for the resistor module, connections 1,2,3, are for speeds 1,2 and 3, connection 4 is the output to the blower motor, speed 4 bypasses the resistor module and goes directly to the blower motor. It's looking like a brush problem.
 
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