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Re: 2002 GMC Sonoma 4 wheel drive


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Sonoma
Novice

Dec 11, 2011, 9:36 AM

Post #1 of 9 (4340 views)
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  post locked   Re: 2002 GMC Sonoma 4 wheel drive  

OK, When it rains it pours. I just found out that the 4-wheel drive is not engaging. When I change from 2-wheel to 4-wheel drive I can hear the transfer case engage and the light on the dash comes on, but that's it, no 4-wheel drive. I am wondering if this is not related to my trouble with the heat selector switch since they both use vacuum(I believe) to change.

I used to hear a "whooooosh" sound when changing the selector for the heat and don't anymore. It seems like an awful coincidence that these two things would quite working at about the same time and NOT be related.

Would you suspect a bad vacuum line somewhere? What would be common to both problems?

Hey, at least I have heat if I get stuck.

Thanks for any help!
Gary


(This post was edited by Hammer Time on Dec 11, 2011, 9:55 AM)


Discretesignals
Veteran / Moderator
Discretesignals profile image

Dec 11, 2011, 9:52 AM

Post #2 of 9 (4331 views)
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  post locked   Re: 2002 GMC Sonoma heating problem [In reply to]  

The HVAC mode doors and the front end actuator on the S15 with a NVG 2 speed transfer case are both vacuum operated.

Inspect the vacuum lines under the hood. You may have a rotted out or disconnected vacuum line. Pay close attention to the vacuum lines around the brake booster area. In the fender on the driver's side is the vacuum reservoir where lines rot out also.







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Dec 11, 2011, 9:55 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 11, 2011, 9:57 AM

Post #3 of 9 (4317 views)
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  post locked   Re: 2002 GMC Sonoma 4 wheel drive [In reply to]  

I detached this part of your question and started a fresh question with it as you should have. We need to keep issues separate.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sonoma
Novice

Dec 11, 2011, 10:22 AM

Post #4 of 9 (4308 views)
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  post locked   Re: 2002 GMC Sonoma 4 wheel drive [In reply to]  

Sorry, I just assumed that the two problems were related so I didn't need to start a new thread.

Thanks!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 11, 2011, 10:47 AM

Post #5 of 9 (4290 views)
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  post locked   Re: 2002 GMC Sonoma 4 wheel drive [In reply to]  

It's possible but will get more attention this way.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sonoma
Novice

Dec 11, 2011, 5:50 PM

Post #6 of 9 (4269 views)
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  post locked   Re: 2002 GMC Sonoma heating problem [In reply to]  


In Reply To
The HVAC mode doors and the front end actuator on the S15 with a NVG 2 speed transfer case are both vacuum operated.

Inspect the vacuum lines under the hood. You may have a rotted out or disconnected vacuum line. Pay close attention to the vacuum lines around the brake booster area. In the fender on the driver's side is the vacuum reservoir where lines rot out also.



I hope it's OK that I borrowed your graphic.
I love it when a plan comes together! Thank you so much! This is what I found........



Selector switch for heater and 4-wheel drive both work again.
Thanks again!
Gary



(This post was edited by Sonoma on Dec 11, 2011, 5:57 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 11, 2011, 5:59 PM

Post #7 of 9 (4265 views)
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  post locked   Re: 2002 GMC Sonoma heating problem [In reply to]  

 

I guess you were right. It was related.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Dec 11, 2011, 6:00 PM)


Chuck319
New User

Sep 24, 2012, 12:05 PM

Post #8 of 9 (3146 views)
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  post locked   Re: 2002 GMC Sonoma heating problem [In reply to]  

I am having the same problem - but it appears that what you found was removed from your post? What was the fix??


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 24, 2012, 12:09 PM

Post #9 of 9 (3142 views)
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  post locked   Re: 2002 GMC Sonoma heating problem [In reply to]  

Please read posting rules and do not respond to old threads.

http://autoforums.carjunky.com/...ORE_POSTING_P122999/




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





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