Blower motor resistor values (4 Viewers)

[Gubbtratt1]

1987 LJ70 if that makes a difference.
What's the resistances of the three resistors, most importantly the biggest one?

 

[coldtaco]

just replace, they are cheap

 

[Gubbtratt1]

just replace, they are cheap

While 25€ won't make me go bankrupt, I do like to fix things whenever possible.

 

[coldtaco]

While 25€ won't make me go bankrupt, I do like to fix things whenever possible.

Ok, don’t know the answer

 

[Eurasiaoverland]

Large 1.0 ohm
Medium 1.2 ohm
Small 1.8 ohm

 

[Gubbtratt1]

Large 1.0 ohm
Medium 1.2 ohm
Small 1.8 ohm

Thank you!

 

[Eurasiaoverland]

The above values are from a brand new, never used Denso unit. I just measured a 35 year old used unit, and get:

Large 0.8 ohm
Medium 1.0 ohm
Small 1.5 ohm.

Just for reference.

 

[LDowney]

Power dissipation is an aspect for consideration too.
A few years back, I attempted to repair my blower motor unit by wiring in resistors of the appropriate ohm values to the burned out unit. It worked fine for a few months but the resistors burned out in time.
Why? The factory resistors are in the air stream of the blower motor so they dissipate heat accordingly. I used resistors with finned metal housing to dissipate heat. These would not fit in the duct housing, so they had be mounted externally. I riveted them to a small piece of metal to function as a heat sink. Either, the piece of metal was not large enough to adequately serve as a heat sink and/or more cooling air flow was needed around the outside of the blower motor.

I hope you are more successful with your approach than I was. Good luck