Quote:
Originally Posted by ASE_Master-Tech
While it is correct that the Hi (max) speed setting will continue to function with a faulty resistor pack, the 'max' setting supply voltage does not run thru the switch.
Most blower motor full speed amperage draws are too high to run directly thru a switch safely & therefor are routed thru a relay, with the switch hi-fan position simply activating the relay.
No offense intended here, just didn't want folks to misunderstand how it works.
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You are partly correct here. The supply side of the blower motor is always switched via a relay no matter what the speed setting is. The return or ground side of the blower motor is either switched through a resistor or combination of resistors for the three lowest speeds, but it is switched directly for the highest speed.