Home » Public Forums » GMCnet » [GMCnet] All GMC A/C dash units. For all years are not worth fixing.
| [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344804] |
Wed, 03 July 2019 00:10  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Haven't read, or posted for a month. But I've just had it on trying to make the dash A/C work properly. The fallowing is what's wrong with ALL of these GMC's. Foam seals on the air control doors are gone. Vacuum diaphragms for the doors are stuck open, or closed. Vacuum lines/control dash valve, junk. Blower, and most related wires/components shot. All air ducts have turned to mush. Just not worth fixing anymore. I'll keep it the dash system for defrost only. MAYBE. Or better. Get a small dash 12V fan. Just put a Vintage Air system with a Sandon compressor in the 73 that I sold a few weeks ago. I installed it for the new owner for FREE. Tried to have the compressor run the Vintage A/C, and dash A/C. Both cooled. But poorly . YES. Some say that running both works. But the gauges say no by the readings. So now I'm disconnecting dash evaporator.
The Vintage A/C dash unit comes with brackets. That are made to hang the evaporator from the dash. These bracket will not work well in our GMC's. So I'm done with a 73/76 install kit. I'm starting to installing a Vintage Air/heat in our 78. So I'm designing 3 floor mounting brackets, and a plumbing kit for Jim K at Applied. That he can provide for all years.. These kits will make the installs simple. The new compressor is simple, light, and not over the valve cover. The Vintage A/C system is really nice. But not to simple to install now. These install kits will make it so anyone can install a complete system. I've sent Jim drawings/templets for the floor mount brackets. For 73 to 77 GMC's. Designing mounting brackets now for 77, and 78. Bob Dunahugh 78 Royale. And 4 COPO Yenkos
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| Re: [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344806 is a reply to message #344804] |
Wed, 03 July 2019 05:40  |
Randy Hecht
Messages: 93
Registered: March 2019
Location: Roswell, GA
Karma: -5
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Sounds great as my 74 ac is inop
Chaplain Randy Hecht
Chaplains are ready to Listen when you're ready to talk.
> On Jul 3, 2019, at 1:10 AM, Bob Dunahugh via Gmclist wrote:
>
> Haven't read, or posted for a month. But I've just had it on trying to make the dash A/C work properly. The fallowing is what's wrong with ALL of these GMC's. Foam seals on the air control doors are gone. Vacuum diaphragms for the doors are stuck open, or closed. Vacuum lines/control dash valve, junk. Blower, and most related wires/components shot. All air ducts have turned to mush. Just not worth fixing anymore. I'll keep it the dash system for defrost only. MAYBE. Or better. Get a small dash 12V fan. Just put a Vintage Air system with a Sandon compressor in the 73 that I sold a few weeks ago. I installed it for the new owner for FREE. Tried to have the compressor run the Vintage A/C, and dash A/C. Both cooled. But poorly . YES. Some say that running both works. But the gauges say no by the readings. So now I'm disconnecting dash evaporator.
> The Vintage A/C dash unit comes with brackets. That are made to hang the evaporator from the dash. These bracket will not work well in our GMC's. So I'm done with a 73/76 install kit. I'm starting to installing a Vintage Air/heat in our 78. So I'm designing 3 floor mounting brackets, and a plumbing kit for Jim K at Applied. That he can provide for all years.. These kits will make the installs simple. The new compressor is simple, light, and not over the valve cover. The Vintage A/C system is really nice. But not to simple to install now. These install kits will make it so anyone can install a complete system. I've sent Jim drawings/templets for the floor mount brackets. For 73 to 77 GMC's. Designing mounting brackets now for 77, and 78. Bob Dunahugh 78 Royale. And 4 COPO Yenkos
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| Re: [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344813 is a reply to message #344804] |
Wed, 03 July 2019 09:20 |
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Tom Lins
Messages: 372
Registered: February 2004
Location: St Augustine, FL
Karma: 1
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Senior Member |
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BobDunahugh wrote on Wed, 03 July 2019 01:10Haven't read, or posted for a month. But I've just had it on trying to make the dash A/C work properly. The fallowing is what's wrong with ALL of these GMC's. Foam seals on the air control doors are gone. Vacuum diaphragms for the doors are stuck open, or closed. Vacuum lines/control dash valve, junk. Blower, and most related wires/components shot. All air ducts have turned to mush. Just not worth fixing anymore. I'll keep it the dash system for defrost only. MAYBE. Or better. Get a small dash 12V fan. Just put a Vintage Air system with a Sandon compressor in the 73 that I sold a few weeks ago. I installed it for the new owner for FREE. Tried to have the compressor run the Vintage A/C, and dash A/C. Both cooled. But poorly . YES. Some say that running both works. But the gauges say no by the readings. So now I'm disconnecting dash evaporator.
The Vintage A/C dash unit comes with brackets. That are made to hang the evaporator from the dash. These bracket will not work well in our GMC's. So I'm done with a 73/76 install kit. I'm starting to installing a Vintage Air/heat in our 78. So I'm designing 3 floor mounting brackets, and a plumbing kit for Jim K at Applied. That he can provide for all years.. These kits will make the installs simple. The new compressor is simple, light, and not over the valve cover. The Vintage A/C system is really nice. But not to simple to install now. These install kits will make it so anyone can install a complete system. I've sent Jim drawings/templets for the floor mount brackets. For 73 to 77 GMC's. Designing mounting brackets now for 77, and 78. Bob Dunahugh 78 Royale. And 4 COPO Yenkos
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Bob
Will you put some pictures of the finished system on the Photo site? I am sure many of us would be very interested to see it.
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, Aluminum Radiator Quad-Bag Suspension Solar Panel
Manuals on DVD
YOUTUBE Channel: GMC Dealer Training Tapes
http://www.bdub.net/tomlins/
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| Re: [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344815 is a reply to message #344804] |
Wed, 03 July 2019 09:44 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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my job, and other projects have gotten in the way of my dash air upgrade in my 75. I was trying to decide weather or not to tie into the existing evaporator, and you convinced me not to. There is a reason I am upgrading, because the OEM one never blew any air, no matter what i tried.(replacing foam gaskets, and messing with the air flappers).
I do not have a Jimk system or a vintage air evaporator, but I ran into the same problem you must be. the interference between the engine hatch, and engine access, and interfearance with the air ride control switches that are on the dash. Your 78 has the switches on the sidewall, so that is not something you have to worry about.
I have a couple different evaporators, so I am not far into looking at all my options, but the direction I am thinking I will end up going is to make a "mobile" mount. make it sturdy, but I think it needs the ability to be moved to a "service location" so I can have full access to the engine hatch.
I know some people will put it at dinette or other locations, but for me, it HAS to be able to blow directly on the passenger and driver.
Has not been a very successful year trying to get the GMC cool. still trying to get the honda ev6010 to work for me, and have not had time to get the dash A/C perfected. the owner of the A/C hose crimping tool I am borrowing is hopefully really patient.
looking forward to the photos of what you come up with.
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] All GMC A/C dash units. For all years are not worth fixing. [message #344822 is a reply to message #344815] |
Wed, 03 July 2019 10:41 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Senior Member |
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You might what to check out my install. Danfoss 25,000 BTU A/C. Ripped out all the OEM and built a plenum that goes under the dash. Used the existing compressor. Works pretty well.
Here is the link to the photo site
http://www.gmcmhphotos.com/photos/mechanical/p26624-new-grill.html
Gary
> On Jul 3, 2019, at 7:44 AM, Jon Roche via Gmclist wrote:
>
> my job, and other projects have gotten in the way of my dash air upgrade in my 75. I was trying to decide weather or not to tie into the existing
> evaporator, and you convinced me not to. There is a reason I am upgrading, because the OEM one never blew any air, no matter what i tried.(replacing
> foam gaskets, and messing with the air flappers).
>
>
> I do not have a Jimk system or a vintage air evaporator, but I ran into the same problem you must be. the interference between the engine hatch, and
> engine access, and interfearance with the air ride control switches that are on the dash. Your 78 has the switches on the sidewall, so that is not
> something you have to worry about.
>
> I have a couple different evaporators, so I am not far into looking at all my options, but the direction I am thinking I will end up going is to
> make a "mobile" mount. make it sturdy, but I think it needs the ability to be moved to a "service location" so I can have full access to the engine
> hatch.
>
> I know some people will put it at dinette or other locations, but for me, it HAS to be able to blow directly on the passenger and driver.
>
> Has not been a very successful year trying to get the GMC cool. still trying to get the honda ev6010 to work for me, and have not had time to get
> the dash A/C perfected. the owner of the A/C hose crimping tool I am borrowing is hopefully really patient.
>
> looking forward to the photos of what you come up with.
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
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| Re: [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344829 is a reply to message #344813] |
Wed, 03 July 2019 13:47 |
Mike Kelley
Messages: 467
Registered: February 2017
Karma: -2
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Senior Member |
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Hi Bob D.:
Way to go man - we all need more or better dash air! Thanks for all your efforts and willingness to share!
Mike/The Corvair a holic
Sent from my iPhone
> On Jul 3, 2019, at 9:20 AM, Tom Lins via Gmclist wrote:
>
> BobDunahugh wrote on Wed, 03 July 2019 01:10
>> Haven't read, or posted for a month. But I've just had it on trying to make the dash A/C work properly. The fallowing is what's wrong with ALL of
>> these GMC's. Foam seals on the air control doors are gone. Vacuum diaphragms for the doors are stuck open, or closed. Vacuum lines/control dash
>> valve, junk. Blower, and most related wires/components shot. All air ducts have turned to mush. Just not worth fixing anymore. I'll keep it the
>> dash system for defrost only. MAYBE. Or better. Get a small dash 12V fan. Just put a Vintage Air system with a Sandon compressor in the 73 that I
>> sold a few weeks ago. I installed it for the new owner for FREE. Tried to have the compressor run the Vintage A/C, and dash A/C. Both cooled. But
>> poorly . YES. Some say that running both works. But the gauges say no by the readings. So now I'm disconnecting dash evaporator.
>> The Vintage A/C dash unit comes with brackets. That are made to hang the evaporator from the dash. These bracket will not work well in our
>> GMC's. So I'm done with a 73/76 install kit. I'm starting to installing a Vintage Air/heat in our 78. So I'm designing 3 floor mounting
>> brackets, and a plumbing kit for Jim K at Applied. That he can provide for all years.. These kits will make the installs simple. The new
>> compressor is simple, light, and not over the valve cover. The Vintage A/C system is really nice. But not to simple to install now. These install
>> kits will make it so anyone can install a complete system. I've sent Jim drawings/templets for the floor mount brackets. For 73 to 77 GMC's.
>> Designing mounting brackets now for 77, and 78. Bob Dunahugh 78 Royale. And 4 COPO Yenkos
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> Bob
> Will you put some pictures of the finished system on the Photo site? I am sure many of us would be very interested to see it.
>
>
> --
> Tom Lins
> St Augustine, FL
> 77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
> Manuals on DVD
> http://www.bdub.net/tomlins/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344832 is a reply to message #344804] |
Wed, 03 July 2019 15:46 |
dsmithy
Messages: 210
Registered: July 2012
Location: Lincoln Nebraska
Karma: 0
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Senior Member |
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As the owner of a ’73 that has been baked and shaken in the hot Phoenix sun for years before I got it, I’m encouraging you to find a solution. My dash air has never worked and multiple comments on this list have suggested that even if I got it working to factory specs it would be a disappointment. So long as I don’t need a third mortgage to afford it, I’m in.
Doug
Douglas & Virginia Smith
dsmithy18 at gmail
Lincoln Nebraska
’73 “Canyonlands” since ‘95: “Wanabizo”, Anishinabe Indian for “He gets lost driving” Yes, really.
Quadrabag/6 wheel disks/3;70 final/Paterson QuadraJet/Thorley’s/Sundry other
P&W PT6, no wait, that's the wish list...
> On Jul 3, 2019, at 12:10 AM, Bob Dunahugh via Gmclist wrote:
>
> Haven't read, or posted for a month. But I've just had it on trying to make the dash A/C work properly. The fallowing is what's wrong with ALL of these GMC's. Foam seals on the air control doors are gone. Vacuum diaphragms for the doors are stuck open, or closed. Vacuum lines/control dash valve, junk. Blower, and most related wires/components shot. All air ducts have turned to mush. Just not worth fixing anymore. I'll keep it the dash system for defrost only. MAYBE. Or better. Get a small dash 12V fan. Just put a Vintage Air system with a Sandon compressor in the 73 that I sold a few weeks ago. I installed it for the new owner for FREE. Tried to have the compressor run the Vintage A/C, and dash A/C. Both cooled. But poorly . YES. Some say that running both works. But the gauges say no by the readings. So now I'm disconnecting dash evaporator.
> The Vintage A/C dash unit comes with brackets. That are made to hang the evaporator from the dash. These bracket will not work well in our GMC's. So I'm done with a 73/76 install kit. I'm starting to installing a Vintage Air/heat in our 78. So I'm designing 3 floor mounting brackets, and a plumbing kit for Jim K at Applied. That he can provide for all years.. These kits will make the installs simple. The new compressor is simple, light, and not over the valve cover. The Vintage A/C system is really nice. But not to simple to install now. These install kits will make it so anyone can install a complete system. I've sent Jim drawings/templets for the floor mount brackets. For 73 to 77 GMC's. Designing mounting brackets now for 77, and 78. Bob Dunahugh 78 Royale. And 4 COPO Yenkos
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Douglas & Virginia Smith,
dsmithy18 at gmail,
Lincoln Nebraska,
’73 “Sequoia” since ‘95: "Wanabizo";
Quadrabag/6 wheel disks/3:70 final/Paterson QuadraJet/Thorley’s/Alloy wheels/Sundry other
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| Re: [GMCnet] All GMC A/C dash units. For all years are not worth fixing. [message #344858 is a reply to message #344832] |
Wed, 03 July 2019 23:21 |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
Karma: 14
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Senior Member |
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Great work, Gary. Brilliant using the old plenum box and extending it into the cabin - it houses a huge system.
I am also impressed with the side-panel vertically mounted small auxiliary evap/fan units that Sean Kidd used. These blow up and then across the person sitting next to them, and recirculate at the floor.
With the 100% recirc of those units combined with the 100% outside air Max Air duct extension and system for the '76 (and 75?) Type II - which blows pretty well and much much better than the under-dash distribution ducts - would make a pretty nice system.
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
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