Home » Public Forums » GMCnet » [GMCnet] Original Air Conditioners, worth fixing?
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259538 is a reply to message #259537] |
Wed, 20 August 2014 21:21   |
James Hupy
Messages: 6806
Registered: May 2010
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Leave them on for 5 minutes or so. They have a delayed start mode that
delays the start of the compressor for 2 or more minutes. Then they sound
like the whole top of the coach is coming down, but soon quiet down
somewhat.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Aug 20, 2014 7:15 PM, "Daniel DeLuca" wrote:
> Hey All,
>
> As I get ready to “complete” the GMC project, I have questions about the
> roof mounted air conditioners. I turn them on and they blow warm air, not
> really surprising. Is it worth trying to fix them or getting an HVAC guy
> out or should I replace them?
>
> Thanks,
>
> Dan
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259539 is a reply to message #259537] |
Wed, 20 August 2014 21:24 |
Daniel DeLuca
Messages: 120
Registered: June 2014
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Jim,
I did not know that, I never left them on all that long, and it did not sound like a compressor came on when I did have them on.
Dan
On Aug 20, 2014, at 10:21 PM, James Hupy wrote:
> Leave them on for 5 minutes or so. They have a delayed start mode that
> delays the start of the compressor for 2 or more minutes. Then they sound
> like the whole top of the coach is coming down, but soon quiet down
> somewhat.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
> On Aug 20, 2014 7:15 PM, "Daniel DeLuca" wrote:
>
>> Hey All,
>>
>> As I get ready to “complete” the GMC project, I have questions about the
>> roof mounted air conditioners. I turn them on and they blow warm air, not
>> really surprising. Is it worth trying to fix them or getting an HVAC guy
>> out or should I replace them?
>>
>> Thanks,
>>
>> Dan
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259540 is a reply to message #259537] |
Wed, 20 August 2014 21:32 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Daniel DeLuca wrote on Wed, 20 August 2014 21:15Hey All,
As I get ready to "complete" the GMC project, I have questions about the roof mounted air conditioners. I turn them on and they blow warm air, not really surprising. Is it worth trying to fix them or getting an HVAC guy out or should I replace them?
Thanks,
Dan Your Maintenance Manual probably has some troubleshooting procedures to help you figure out what is wrong, so you can decide if you want to fix them yourself, hire someone to fix them, or replace them.
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259541 is a reply to message #259537] |
Wed, 20 August 2014 21:38 |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Senior Member |
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I thought mine was bad too, but turned out to be the long delayed start. When the compressor kicks in you will know it. I do like the inside controls on my original a/c vs. the new units. My original Duotherm allows you to send all of the air either toward the front or rear, or you can balance in any ratio front to rear. Great air control for shooting lots of air to the cockpit when driving. You can't do that with my newer Coleman
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259542 is a reply to message #259539] |
Wed, 20 August 2014 21:36 |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
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Senior Member |
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To hijack the thread, I just happen to have a perfectly functional
original AC sitting here. Free to anyone who comes and get it from
Eugene, OR.
Worked fine, it was just loud and heavy. Both of which are traits it
probably had when new. I replaced it with a new Dometic, taking 70# off
the roof at the same time.
Kelvin
'73 23' in Eugene, OR
>> Leave them on for 5 minutes or so. They have a delayed start mode that
>> delays the start of the compressor for 2 or more minutes. Then they sound
>> like the whole top of the coach is coming down, but soon quiet down
>> somewhat.
>> Jim Hupy
>> Salem, Or
>> 78 GMC ROYALE 403
>> On Aug 20, 2014 7:15 PM, "Daniel DeLuca" wrote:
>>
>>> Hey All,
>>>
>>> As I get ready to “complete” the GMC project, I have questions about the
>>> roof mounted air conditioners. I turn them on and they blow warm air, not
>>> really surprising. Is it worth trying to fix them or getting an HVAC guy
>>> out or should I replace them?
>>>
>>> Thanks,
>>>
>>> Dan
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259543 is a reply to message #259537] |
Wed, 20 August 2014 21:42 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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The push-on flag terminals for all the connections can get corroded. Also the caps and relays can go bad. There is a time delay relay most likely to fail that can easilly be bypassed. I'm assuming the compressor is not starting. These are hermetic units unlike the dash AC so they should not leak R22. I'd start there. They were durable units and mine both work great, plus Look period correct
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259545 is a reply to message #259539] |
Wed, 20 August 2014 21:51 |
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wally
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
Karma: 5
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Daniel DeLuca wrote on Wed, 20 August 2014 21:24Jim,
I did not know that, I never left them on all that long, and it did not sound like a compressor came on when I did have them on.
Dan
On Aug 20, 2014, at 10:21 PM, James Hupy wrote:
> Leave them on for 5 minutes or so. They have a delayed start mode that
> delays the start of the compressor for 2 or more minutes. Then they sound
> like the whole top of the coach is coming down, but soon quiet down
> somewhat.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
> On Aug 20, 2014 7:15 PM, "Daniel DeLuca" wrote:
>
>> Hey All,
>>
>> As I get ready to "complete" the GMC project, I have questions about the
>> roof mounted air conditioners. I turn them on and they blow warm air, not
>> really surprising. Is it worth trying to fix them or getting an HVAC guy
>> out or should I replace them?
>>
>> Thanks,
>>
>> Dan
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
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> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Some of us have bypassed the delayed start relay if it turns out not to work. One of ours is bypassed.
http://www.gmcmhphotos.com/photos/g6178-duo-therm-time-delay-removal.html
http://www.gmcmhphotos.com/photos/g3615-roof-ac-modification.html
HTH
Wally Anderson
Omaha NE
75 Glenbrook
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259550 is a reply to message #259537] |
Wed, 20 August 2014 22:31 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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I have two originals that when I went to the beach earlier this month both worked great. By day nine, I had one that the fan would hum but not turn, and the second the compressor would cycle for a quarter of a second and cycle out. I haven't had time to climb around and look for easy fixes like connectors yet. This was the same trip where a plastic cone broke (fortunately while stationary under increased air pressure to level the coach rather than going down the road) and cut a perfectly good bag with the shrapnel. We ran fans the last night with windows open, and Jim K talked me through adding in a 4x4 post to replace air bag and drove it home that way. Thank you Jim and Nick! My coach has an extra bag from the PO, but with a broken cone, it didn't do me any good. I'll carry my wood block as my backup now. Back to AC - mine work great when working right.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259577 is a reply to message #259542] |
Thu, 21 August 2014 08:58 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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I'll take I Kelvin if it is still available.
Todd Sullivan
Sully
77 royale
Seattle
> On Aug 20, 2014, at 7:36 PM, Kelvin Dietz wrote:
>
> To hijack the thread, I just happen to have a perfectly functional
> original AC sitting here. Free to anyone who comes and get it from
> Eugene, OR.
>
> Worked fine, it was just loud and heavy. Both of which are traits it
> probably had when new. I replaced it with a new Dometic, taking 70# off
> the roof at the same time.
>
> Kelvin
> '73 23' in Eugene, OR
>>> Leave them on for 5 minutes or so. They have a delayed start mode that
>>> delays the start of the compressor for 2 or more minutes. Then they sound
>>> like the whole top of the coach is coming down, but soon quiet down
>>> somewhat.
>>> Jim Hupy
>>> Salem, Or
>>> 78 GMC ROYALE 403
>>>> On Aug 20, 2014 7:15 PM, "Daniel DeLuca" wrote:
>>>>
>>>> Hey All,
>>>>
>>>> As I get ready to “complete” the GMC project, I have questions about the
>>>> roof mounted air conditioners. I turn them on and they blow warm air, not
>>>> really surprising. Is it worth trying to fix them or getting an HVAC guy
>>>> out or should I replace them?
>>>>
>>>> Thanks,
>>>>
>>>> Dan
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
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_______________________________________________
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259578 is a reply to message #259545] |
Thu, 21 August 2014 09:07 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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In the midst of all this, someone should mention that the reason for that
time delay is to allow the system voltage to stabiilze before the air
conditioner starts -- especially when on Onan power. So let the Onan start
running smoothly before switching on the A/C.
Also, the primary cause of blown bridge rectifiers on the Onan is shutting
down that unit with the A/C running -- DON"T DO THAT! Even on the modern
A/C's and modern generators, it's still recommended to turn OFF A/C before
generator. The reason behind that recommendation can get a little
complicated, but basically it's the same reason ignition coils fire when
the points OPEN rather than when they close -- a collapsing magnetic field
generates a very rapid increase in voltage which can exceed the ratings of
the bridge rectifiers.
Be sure everyone in the coach knows the rule: "A/C off BEFORE Onan."
Just like "Nothing in the toilet that hasn't already been eaten."
Ken H.
On Wed, Aug 20, 2014 at 10:51 PM, Wally Anderson
wrote:
>
> Some of us have bypassed the delayed start relay if it turns out not to
> work. One of ours is bypassed.
> http://www.gmcmhphotos.com/photos/g6178-duo-therm-time-delay-removal.html
> http://www.gmcmhphotos.com/photos/g3615-roof-ac-modification.html
>
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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: [GMCnet] Original Air Conditioners, worth fixing? [message #259846 is a reply to message #259578] |
Sat, 23 August 2014 18:10 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Kelvin,
My emails sent directly to you are getting bounced back.
206nine48fivetwoone0
Sully
77 royale
Seattle
Todd Sullivan
> On Aug 21, 2014, at 7:07 AM, Ken Henderson wrote:
>
> In the midst of all this, someone should mention that the reason for that
> time delay is to allow the system voltage to stabiilze before the air
> conditioner starts -- especially when on Onan power. So let the Onan start
> running smoothly before switching on the A/C.
>
> Also, the primary cause of blown bridge rectifiers on the Onan is shutting
> down that unit with the A/C running -- DON"T DO THAT! Even on the modern
> A/C's and modern generators, it's still recommended to turn OFF A/C before
> generator. The reason behind that recommendation can get a little
> complicated, but basically it's the same reason ignition coils fire when
> the points OPEN rather than when they close -- a collapsing magnetic field
> generates a very rapid increase in voltage which can exceed the ratings of
> the bridge rectifiers.
>
> Be sure everyone in the coach knows the rule: "A/C off BEFORE Onan."
> Just like "Nothing in the toilet that hasn't already been eaten."
>
> Ken H.
>
>
> On Wed, Aug 20, 2014 at 10:51 PM, Wally Anderson
> wrote:
>
>>
>> Some of us have bypassed the delayed start relay if it turns out not to
>> work. One of ours is bypassed.
>> http://www.gmcmhphotos.com/photos/g6178-duo-therm-time-delay-removal.html
>> http://www.gmcmhphotos.com/photos/g3615-roof-ac-modification.html
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259850 is a reply to message #259578] |
Sat, 23 August 2014 18:49 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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The initial time delay is truly a help for a just started generator after that the time delay will allow the system refrigerant pressure to equalize so the compressor will start easier after a short shut down.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Original Air Conditioners, worth fixing? [message #259871 is a reply to message #259539] |
Sat, 23 August 2014 22:17 |
rvanwin
Messages: 325
Registered: April 2007
Location: Battlefield, MO
Karma: 6
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Senior Member |
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Daniel DeLuca wrote on Wed, 20 August 2014 21:24Jim,
I did not know that, I never left them on all that long, and it did not sound like a compressor came on when I did have them on.
After not having used the AC for a while, I always had to reach up and give the AC a good thump to "help" the delay relay kick in. After that, it would work OK until it sat for a few weeks.
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO
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