I have a 2008 Ford F350 Super Duty. The blower motor refused to work 3 times in the last 10 days or so, including today after work. I stopped at O'Reilly and bought an aftermarket blower motor and aftermarket "resistor". My vehicle has the automatic temp control option so it's not really a resistor, it's a fancier controller.
After cursing the engineer that designed the subsystem for about 30 mintues I was able to get the old resistor out. I put in the new resistor and left the old motor. The old motor would spin full speed but would not slow down to a lower setting. An improvement but not correct. I installed the new blower motor. Same story, it spins at full speed and cannot be slowed down with the dash controller.
So, what do you think? Did I fry the new "resistor" but trying it with the old fan? Or is the aftermarket resistor just a piece of junk? Is it something else? Everything I read says if it will only run a full speed then your resistor is dead.
I already ordered a new OEM (Motorcraft 9l3z-19e624-b) resistor from Rock Auto.
I struggled to avoid jokes about your mom while writing this OP.
After cursing the engineer that designed the subsystem for about 30 mintues I was able to get the old resistor out. I put in the new resistor and left the old motor. The old motor would spin full speed but would not slow down to a lower setting. An improvement but not correct. I installed the new blower motor. Same story, it spins at full speed and cannot be slowed down with the dash controller.
So, what do you think? Did I fry the new "resistor" but trying it with the old fan? Or is the aftermarket resistor just a piece of junk? Is it something else? Everything I read says if it will only run a full speed then your resistor is dead.
I already ordered a new OEM (Motorcraft 9l3z-19e624-b) resistor from Rock Auto.
I struggled to avoid jokes about your mom while writing this OP.