Home » Public Forums » GMCnet » dash climate control (broke)
| dash climate control [message #120708] |
Sun, 03 April 2011 17:06  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Just digging into the issues with my dash controls, and found my climate control unit is broke. the vacuum stuff seems to work fine, but it is the plastic part that allows the levers to move side to side. the pin top to bottum is broke.
is there a repair? and what years of cars would fit? I have access to some suburbans. but they are late 80's.
I see alot about fixing the vacuum wafers, but I do not think that is my problem.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] dash climate control [message #120710 is a reply to message #120708] |
Sun, 03 April 2011 17:15  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Jon,
You should go to this site on GMCWS:
http://www.gmcws.org/Tech/junkyardgems/index.htm
Download the document and look on page 4.
Don't loose the gmc coach OEM disc.
J.R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (Sold Pending Closing)
'78 Transmode Custom (Purchased Pending closing)
1975 Avion (Under Reconstruction)
Michigan
On Apr 3, 2011, at 6:06 PM, Jon Roche wrote:
>
>
> Just digging into the issues with my dash controls, and found my
> climate control unit is broke. the vacuum stuff seems to work fine,
> but it is the plastic part that allows the levers to move side to
> side. the pin top to bottum is broke.
>
> is there a repair? and what years of cars would fit? I have access
> to some suburbans. but they are late 80's.
>
> I see alot about fixing the vacuum wafers, but I do not think that
> is my problem.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: dash climate control [message #120712 is a reply to message #120708] |
Sun, 03 April 2011 17:33 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Jon wrote on Sun, 03 April 2011 15:06 |
Just digging into the issues with my dash controls, and found my climate control unit is broke. the vacuum stuff seems to work fine, but it is the plastic part that allows the levers to move side to side. the pin top to bottum is broke.
is there a repair? and what years of cars would fit? I have access to some suburbans. but they are late 80's.
I see alot about fixing the vacuum wafers, but I do not think that is my problem.
|
Jon,
I just recently fixed the same problem on my dash HVAC control. The center pivot pin had broken back in November and it took me a while to realize it was even broken. It didn't feel right, but I must have been in denial because I didn't want to face fixing it.
It was really not a big deal. I got the new aluminum pivot pin (that I believe is made by Sirum's) from Jim K, and the installation was relatively easy. You have to remove the dash cover, remove the dash trim bezel, un-plug the wiring and vacuum harnesses, and disconnect a cable from the unit, then it comes out by removing four screws from the front of the dash panel.
The control consists of a series of cams that ride on that pin. You will want to pry the two little knobs off the sliders on the front, and be careful to keep the parts straight so you can re-assemble them in the opposite order that you removed them. I cleaned up the parts and lubricated them with spray white lithium grease and made sure the cable was lubricated also.
It took me a couple of months of thinking about doing it before I finally tackled the job, and probably less than two hours to fix the thing, once I finally got myself to do it. It was really a pretty easy thing to fix.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] dash climate control [message #120717 is a reply to message #120712] |
Sun, 03 April 2011 18:07 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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On Sun, Apr 3, 2011 at 6:33 PM, Carl Stouffer <carljr3b@yahoo.com> wrote:
>
> ...
The control consists of a series of cams that ride on that pin. You will
> want to pry the two little knobs off the sliders on the front, and be
> careful to keep the parts straight so you can re-assemble them in the
> opposite order that you removed them. I cleaned up the parts and lubricated
> them with spray white lithium grease and made sure the cable was lubricated
> also.
>
>
That's good: "white lithium grease". Just in Case: DON'T use a silicone
grease -- you or a SO (Subsequent Owner) may install EFI; its O2 sensor
won't like the silicone. Something we all need to think about when
introducing silicone into anywhere in the engine or any of its plumbing.
Ken H.
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Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: dash climate control [message #120743 is a reply to message #120712] |
Sun, 03 April 2011 23:00 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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Senior Member |
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| Carl S. wrote on Sun, 03 April 2011 15:33 |
| Jon wrote on Sun, 03 April 2011 15:06 |
Just digging into the issues with my dash controls, and found my climate control unit is broke. the vacuum stuff seems to work fine, but it is the plastic part that allows the levers to move side to side. the pin top to bottum is broke.
is there a repair? and what years of cars would fit? I have access to some suburbans. but they are late 80's.
I see alot about fixing the vacuum wafers, but I do not think that is my problem.
|
Jon,
I just recently fixed the same problem on my dash HVAC control. The center pivot pin had broken back in November and it took me a while to realize it was even broken. It didn't feel right, but I must have been in denial because I didn't want to face fixing it.
It was really not a big deal. I got the new aluminum pivot pin (that I believe is made by Sirum's) from Jim K, and the installation was relatively easy. You have to remove the dash cover, remove the dash trim bezel, un-plug the wiring and vacuum harnesses, and disconnect a cable from the unit, then it comes out by removing four screws from the front of the dash panel.
The control consists of a series of cams that ride on that pin. You will want to pry the two little knobs off the sliders on the front, and be careful to keep the parts straight so you can re-assemble them in the opposite order that you removed them. I cleaned up the parts and lubricated them with spray white lithium grease and made sure the cable was lubricated also.
It took me a couple of months of thinking about doing it before I finally tackled the job, and probably less than two hours to fix the thing, once I finally got myself to do it. It was really a pretty easy thing to fix.
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This is the exact correct response to the problem, the pin is about $10 and it is not all that difficult to put in. In the 70's they thought that Nylon plastic was forever. Turns out it is not. I do sewing machine repairs for a hobby and there are many that have nylon gears or plastic cam parts that have failed and are no longer available. Then they are junk. Fortunately this part is available from our vendors and is made of Alum.
Any used control you might happen to find in a junk yard would have the same age part and the same issue.
Rob Allen
former owner of '76 x-PB
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| Re: dash climate control [message #120770 is a reply to message #120708] |
Mon, 04 April 2011 07:46 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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excellent. I will be on the phone this morning to order up that PIN. that should be exactly the fix.
I have not seen talk of that part anywhere before.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] dash climate control [message #120792 is a reply to message #120789] |
Mon, 04 April 2011 09:40 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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I did. at first look, it sounded what I was talking about. But the last statement "The pin gets brittle and breaks and then the unit leaks vacuum". Confused me. and sent me looking elsewhere.
the broken pin really is not tied to any vacuum when I look at it. just causes the levers not to move properly, or get to the correct position. so I thought that PIN was some internal to the vacuum switch.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Can we blame Dan for this????