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Dashboard Blower Works on High Only

fan blower dashboard switch resistor

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5 replies to this topic

#1 AndyShane


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Posted 07 February 2013 - 07:21 AM

I didn't realize this problem is so common in cars, and I've been putting up with it for two weeks.


The switch has four speed settings; nothing happens until High is selected.


In the course of troubleshooting, I erroneously decided the switch was at fault using a multimeter, and found a replacement at the local Napa store for $20.  


You can already guess: the problem persists with the new switch.  That pretty much narrows the search down to the blower motor resistor; but, finding it has been a challenge.


I introduced the problem at iRV2 last night, and a fine guy immediately proposed l look atop the plenum, sent a photo.  


Well, Beaver owners, there is a challenge here: our Canadian friends have wedged the connector against the underside of the dash.  Then, to compound the difficulty, someone has encased my resistor pack in a huge mass of expanding foam.


Has anyone done this procedure?  Any tips?


As the repair progresses, I'll post news so that future owners can be spared the spooling up I've endured...


The AC unit was made by Specific Climate Systems of Fort Worth, amazingly.  Not fifteen miles away, as the crow flies.  However, they have apparently gone out of business.

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2007 Beaver Patriot Thunder Winchester44 III C13 Caterpillar 525hp with Silverleaf system; using a Roadmaster 2000-1 to pull a Prius, or a CargoCraft Dragster with a Lexus IS250C inside.
Defected from iRV2 in March 2012 after that forum suffered an outbreak of political bullying; once again contributing there as RVNeophytes2 effective Feb 6, 2013.

#2 wolfe10


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Posted 07 February 2013 - 09:30 AM

Yes, the resistor is the common Gremlin when you have high fan speed, but no lower speeds.

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Brett and Dianne Wolfe
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#3 hermanmullins


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Posted 07 February 2013 - 09:40 AM

Yes Andy I have replaced quite a few resistor in autos. And it was right there in plain sight on the right side firewall in the plenum. Is your between the plenum and wall in your entrance under the dash? If so it may be a job removing not only the foam but the screws also. Good luck and be careful.



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"Fair winds and Following Seas"

Herman & Bobbie Mullins, F302225
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#4 DickandLois


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Posted 07 February 2013 - 03:26 PM

Andy, The resistor is the bad boy in most cases.  With it being wedged between the blower housing and the dash, could you remove the blower housing; cut through the foam with a knife and remove the assembly so you can work on it. 

Anything in your photo files yet?



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#5 donfultz



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Posted 25 March 2013 - 07:51 AM

New to FMCA, tire deal attracted me.  I had the same symptoms on aonn 05 VECTRA.  Followed the same logic, switch  replacement and then the fan speed resistor without any affect.  Finally replaced the fan speed relay and this did the trick-all speeds back.

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#6 DickandLois


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Posted 25 March 2013 - 08:24 AM

Hi Don, welcome to FMCA !

Thanks for your feedback.



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