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Post Info TOPIC: Interior heating / ac fan stopped working


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Interior heating / ac fan stopped working


Hi guys

My 01 Montana has a problem that apparently is not unique. The climate control fan speed selector stopped working last week. Speed 5 had stopped 2 years ago. Everything else works so when I select fan speed for the rear compartment everything works well, a/c, ventilation, defog, etc. 

mM8SOG-wZsZTNVQ4Zt475RA.jpg

It seems likethe switch behind the know is defective. I took it apart but I have no clue what to do since the flat board is all welded together. Anybody have any ideas? The part is the same in the Venture and Silhouette models from 1997-2004.

My issue is that I intend to change car in a few months and am not going to spend big bucks to get a new part; would consider swapping one from a scrapyard or car for parts. Regards,

 

Leo



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan



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Sounds like the same problem I had with a 2002 GP, but it would stay on high speed only at first, even when the car was off.  Took out the fuse for high so the other speeds worked and eventually it quit altogether.  Quote to repair was over 600 to change the panel (switches).

Googled the problem, turns out that is quite common, and did it myself with $40 part. It was the resistor that controls the fan speed failed from water leakage under the cowl area. 



-- Edited by 1965CS on Wednesday 16th of July 2014 12:52:33 PM

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65 Custom Sport Convertible

Southern Alberta



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Interesting. If I pull the part out and photograph it would you be able to point out where the problem was on your GP?  I don't have a soldering iron so I want to show it to my friend to see if he can get it to work.  Been to a junkyard already but they didn't have the exact unit.



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan



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On the GP, the part in question is a small green circuit board with a coil resistor mounted on it.  It plugs into the fan harness and it's located near the fan motor.  Mounts with 2 screws and the coil side faces the inside of the duct work to measure air temperature.   Apparently the GP is notorious for leaking around the windshield cowl and this part gets constant moisture so eventually shorts out, - could be similar issue with yours.

This is with the fan out, (the green part is the resistor unit)

Capture.PNG

Looks similar to this one:

Capture 2.PNG



-- Edited by 1965CS on Wednesday 16th of July 2014 02:09:04 PM

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65 Custom Sport Convertible

Southern Alberta



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Thanks. I'll open it up one of these evenings and see if I find the same.

 

Regards,



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan



Guru

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Posts: 575
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I tried different control units and eliminated that as the problem.

Any idea where I might access the fan motor in a Montana? These vans are hard to get into...

 



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan



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http://www.youtube.com/watch?v=oO2-H9wh6GE



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427carl wrote:

http://www.youtube.com/watch?v=oO2-H9wh6GE


At the 3:40 mark you can see a green module that is bolted next to the motor, that is what controls the speeds etc,

I would definitely look at that one, probably your culprit.

Gerry P

 



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Canadian Poncho Supporting Member



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Understood. Will try it in the shade ... wish me luck!

 



__________________

"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan



Guru

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Posts: 575
Date:

Nothing determined with certainty. My best guess at this point is that the motor may be shot.

I took all apart, tested with a voltmeter so the juice is definitely getting there therefor the control switch is working. The module seems to be fine although I'm not 100% sure because when I turn the know to speed 5, I hear a "click." However nothing happens at any speed. The fan itself looks visually healthy.

 



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan



Guru

Status: Offline
Posts: 575
Date:

67custom wrote:
427carl wrote:

http://www.youtube.com/watch?v=oO2-H9wh6GE


At the 3:40 mark you can see a green module that is bolted next to the motor, that is what controls the speeds etc,

I would definitely look at that one, probably your culprit.

Gerry P

 


CASE CLOSED. It was the module. 



__________________

"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan

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