Blower Motor Resistor Red Hot?

[old_man]

I love all the old wives tales.

 

[Sidewinder CC]

Pretty sure it was one of the GM training classes I took a very long time ago. I was taught that a circuit controlled on the ground side had less arc potential and thus less transfer of material between the switch contacts, lengthening the service life of relays and the like.

Close.

Read about Flyback Diodes here:

https://en.wikipedia.org/wiki/Flyback_diode

https://en.wikipedia.org/wiki/Snubber

A Flyback Diode in the HVAC Blower would serve a similar function as the diode in the AC Compressor Clutch circuit (see text in pic).