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Guest Message by DevFuse
 

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98 OBW, heater fan motor control problem


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9 replies to this topic

#1 Rooster2

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Posted 18 January 2018 - 12:15 PM

My heater fan motor will only operate on fastest speed. I think the problem must be in resistor cluster. Where is this located?? Is it built into the HVAC controls in dashboard??

 

Thanks for any help.



#2 1 Lucky Texan

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Posted 18 January 2018 - 01:02 PM

maybe number 17 here;


http://opposedforces...illustration_1/


not sure if I have the right model, probably similar though.

#3 Rooster2

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Posted 18 January 2018 - 01:20 PM

maybe number 17 here;


http://opposedforces...illustration_1/


not sure if I have the right model, probably similar though.

 

 

Thanks Texan for the link. I am not sure what I am seeing on the link diagrams, but looks like it may be built into the dashboard HVAC unit. I happen to have a replacement unit handy, so may install that unit to see if it cures my problem. Thanx!



#4 1 Lucky Texan

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Posted 18 January 2018 - 01:44 PM

Thanks Texan for the link. I am not sure what I am seeing on the link diagrams, but looks like it may be built into the dashboard HVAC unit. I happen to have a replacement unit handy, so may install that unit to see if it cures my problem. Thanx!

I think that's behind the glove box - but toward the centerline of the car. Hopefully, someone else will respond.

Edited by 1 Lucky Texan, 18 January 2018 - 01:45 PM.


#5 idosubaru

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Posted 18 January 2018 - 01:47 PM

what he said - should be #17, all the ones i've ever seen are accessed in the lower passengers footwell, other than a cover or something i think it's easily accessible. 

 

i feel like one model i've done i had to remove the blower motor to get to it.  other than XT6's i've only done like 1 of each model i've encountered so they all kind of run together.  but none have ever been hard or more than just cover or something to get to. 



#6 Rooster2

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Posted 18 January 2018 - 01:58 PM

Thanks guys for the advise. As I posted earlier, I have an HVAC unit that I can install. It appears looking through holes in the plastic housing, that there are copper windings attached to the fan speed rotary switch shaft. I can swap it in to see if it fixes the problems, if not then I search  behind the glove box - but toward the centerline of the car as advised. Thanx!



#7 Gloyale

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Posted 18 January 2018 - 02:20 PM

Thanks guys for the advise. As I posted earlier, I have an HVAC unit that I can install. It appears looking through holes in the plastic housing, that there are copper windings attached to the fan speed rotary switch shaft. I can swap it in to see if it fixes the problems, if not then I search  behind the glove box - but toward the centerline of the car as advised. Thanx!

 

The resistor block is in the Ducting, between the Blower and the Evap core. rectangular 4 pin plug.  IT's in the ducting to keep the resistor cool from air movement.

 

NOT in the switch.



#8 Rooster2

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Posted 19 January 2018 - 02:06 PM

Thanks to all for the help, especially to Gloyale. Your description of "The resistor block is in the Ducting, between the Blower and the Evap core. rectangular 4 pin plug", was precisely the info I needed to find one in a wrecking yard. Otherwise, I would not really know exactly what I was looking for. Resistor unit I bought was from a 98 Impreza Outback Sport, but figure the resistor unit is interchangeable with a Legacy car. Now to install it.



#9 djmark7

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Posted 20 January 2018 - 07:18 AM

take out the glove box youll be looking right at it :)



#10 Rooster2

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Posted 20 January 2018 - 09:21 AM

take out the glove box youll be looking right at it :)

Good idea..........when I pulled one from a yard, the glove box was already pulled, so made for an easy pull. I will do that later today, when it warms up a little outside.






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