Blower motor resistor values

[CHRIS PERRY]

Steve, Al and Huw, 
Thanks for the replies.  I had replaced the blower motor and heater core and was hoping that the new blower motor would fix the issue of only running on the highest two speeds. Alas, that was not the case.  I used my DMM to check continuity on the switch as well as the wiring harness to the resister and they both checked out good.  By process of elimination the resistor seems to be bad.  I found one locally for 45.00 ( about 15.00 more than online) but at least I'll have it today.
 
Chris Perry
 

 

> ... not familiar with your vehicle ... speeds 3 & 4 are the higher speeds,
> right? Do you see 3 or 4 taps on the resistor? 
> 
> You may not find resistance values in Bentley, but you should be able to
> find out how the fan is wired in your car. Some motors have multiple speeds
> built into them. Rather than worrying about resistance values use the
> voltage setting to determine whether or not power is getting to the motor at
> all switch positions. If you find that the motor has a voltage at its pins
> but is not spinning you will know that the motor is faulty, otherwise no
> voltage means the resistor or wiring are bad, and you can track it via the
> wiring diagram.
> 
> Steve Buchholz
> 
> 
> Message: 8
> On my '90 80 I replaced two resistors in about 8 months. Then I noticed that 
> my fan was not blowing as before and that it had some small noises. It 
> needed to be replaced. When the motor stalls or binds, it draws too much 
> current.
> 
> Save some time and money, replace both the fan motor and the resistor. It is 
> a fairly easy job.
> 
> Al
>