Home » Public Forums » GMCnet » 76 Birch air conditioning - I'm going in
| 76 Birch air conditioning - I'm going in [message #365483] |
Sat, 17 July 2021 07:16  |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
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Senior Member |
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This coach was restored in 2013 and then sat for seven years. I've been slowly recommissioning it.
The AC worked. Now it doesn't. Apparently a very slow leak. It has no pressure but it holds vacuum.
It had been converted to R134. I have a case of duracool.
So what do i need to know besides adding duracool and crossing fingers ?
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365484 is a reply to message #365483] |
Sat, 17 July 2021 08:48  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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If you have R-134a, and it was professionally installed, they used an oil
specifically compatible with that refrigerant. It will NOT BE compatible
with either R-12 or Duracool type refrigerants. The system must be pumped
down, the dessicant/dryer replaced, and thoroughly flushed of all that old
lubricant. If you have an OEM compressor, it should be drained and flushed,
and new lube filled. If you don't flush and replace the lube, be prepared
for a system full of sludge.
Jim Hupy
Salem, Oregon
On Sat, Jul 17, 2021, 5:17 AM dave silva wrote:
> This coach was restored in 2013 and then sat for seven years. I've been
> slowly recommissioning it.
>
> The AC worked. Now it doesn't. Apparently a very slow leak. It has no
> pressure but it holds vacuum.
>
> It had been converted to R134. I have a case of duracool.
>
> So what do i need to know besides adding duracool and crossing fingers ?
>
>
> --
> Dave & Ellen Silva
> Hertford, NC
>
> 76 Birchaven, 1-ton and other stuff
>
> Currently planning the Great american Road Trip Summer 2021
>
> It's gonna take a lot of Adderall to get this thing right.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365485 is a reply to message #365484] |
Sat, 17 July 2021 09:05 |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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James
Duracool is compatible with the oil used with R12 and also compatible with the oil used with R134a.
If the system was properly converted for R134a then Duracool can be installed without changing anything.
Emery STORA
77 Kingsley
Frederick CO
> On Jul 17, 2021, at 7:49 AM, James Hupy wrote:
>
> If you have R-134a, and it was professionally installed, they used an oil
> specifically compatible with that refrigerant. It will NOT BE compatible
> with either R-12 or Duracool type refrigerants. The system must be pumped
> down, the dessicant/dryer replaced, and thoroughly flushed of all that old
> lubricant. If you have an OEM compressor, it should be drained and flushed,
> and new lube filled. If you don't flush and replace the lube, be prepared
> for a system full of sludge.
> Jim Hupy
> Salem, Oregon
>
>> On Sat, Jul 17, 2021, 5:17 AM dave silva wrote:
>>
>> This coach was restored in 2013 and then sat for seven years. I've been
>> slowly recommissioning it.
>>
>> The AC worked. Now it doesn't. Apparently a very slow leak. It has no
>> pressure but it holds vacuum.
>>
>> It had been converted to R134. I have a case of duracool.
>>
>> So what do i need to know besides adding duracool and crossing fingers ?
>>
>>
>> --
>> Dave & Ellen Silva
>> Hertford, NC
>>
>> 76 Birchaven, 1-ton and other stuff
>>
>> Currently planning the Great american Road Trip Summer 2021
>>
>> It's gonna take a lot of Adderall to get this thing right.
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365486 is a reply to message #365485] |
Sat, 17 July 2021 09:56 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Au Contraire' Emery.
R-12 lube is mineral based.
R-134a lube is not mineral oil, but is something called PAG which is a
synthetic lube. According to the Rules and Laws, R-134a and R-12 cannot be
mixed, that goes for HC-12a or "duracool" as well. Emery, you can do as
you wish, but those are the facts as I learned them from GM Training
School. Still have the books. I went and looked them up. Just what I was
taught.
Jim Hupy
Salem, Oregon
On Sat, Jul 17, 2021, 7:05 AM Emery Stora via Gmclist <
gmclist@list.gmcnet.org> wrote:
> James
> Duracool is compatible with the oil used with R12 and also compatible with
> the oil used with R134a.
> If the system was properly converted for R134a then Duracool can be
> installed without changing anything.
>
> Emery STORA
> 77 Kingsley
> Frederick CO
>
>> On Jul 17, 2021, at 7:49 AM, James Hupy wrote:
>>
>> If you have R-134a, and it was professionally installed, they used an
> oil
>> specifically compatible with that refrigerant. It will NOT BE compatible
>> with either R-12 or Duracool type refrigerants. The system must be
> pumped
>> down, the dessicant/dryer replaced, and thoroughly flushed of all that
> old
>> lubricant. If you have an OEM compressor, it should be drained and
> flushed,
>> and new lube filled. If you don't flush and replace the lube, be prepared
>> for a system full of sludge.
>> Jim Hupy
>> Salem, Oregon
>>
>>> On Sat, Jul 17, 2021, 5:17 AM dave silva wrote:
>>>
>>> This coach was restored in 2013 and then sat for seven years. I've been
>>> slowly recommissioning it.
>>>
>>> The AC worked. Now it doesn't. Apparently a very slow leak. It has no
>>> pressure but it holds vacuum.
>>>
>>> It had been converted to R134. I have a case of duracool.
>>>
>>> So what do i need to know besides adding duracool and crossing fingers ?
>>>
>>>
>>> --
>>> Dave & Ellen Silva
>>> Hertford, NC
>>>
>>> 76 Birchaven, 1-ton and other stuff
>>>
>>> Currently planning the Great american Road Trip Summer 2021
>>>
>>> It's gonna take a lot of Adderall to get this thing right.
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
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> Unsubscribe or Change List Options:
>
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365487 is a reply to message #365486] |
Sat, 17 July 2021 10:08 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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The one oil that both refrigerants ARE compatible with is called POE,
which is Polyol Ester Oil.
If, when the R-134a was introduced into Dave's GMC that oil was used, then
HC-12a can be added to replace R-134a with no ill effects. Just Sayin, that
is a big IF.
Jim Hupy
Salem, Oregon
On Sat, Jul 17, 2021, 7:56 AM James Hupy wrote:
> Au Contraire' Emery.
> R-12 lube is mineral based.
> R-134a lube is not mineral oil, but is something called PAG which is a
> synthetic lube. According to the Rules and Laws, R-134a and R-12 cannot be
> mixed, that goes for HC-12a or "duracool" as well. Emery, you can do as
> you wish, but those are the facts as I learned them from GM Training
> School. Still have the books. I went and looked them up. Just what I was
> taught.
> Jim Hupy
> Salem, Oregon
>
> On Sat, Jul 17, 2021, 7:05 AM Emery Stora via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> James
>> Duracool is compatible with the oil used with R12 and also compatible
>> with the oil used with R134a.
>> If the system was properly converted for R134a then Duracool can be
>> installed without changing anything.
>>
>> Emery STORA
>> 77 Kingsley
>> Frederick CO
>>
>>> On Jul 17, 2021, at 7:49 AM, James Hupy wrote:
>>>
>>> If you have R-134a, and it was professionally installed, they used an
>> oil
>>> specifically compatible with that refrigerant. It will NOT BE compatible
>>> with either R-12 or Duracool type refrigerants. The system must be
>> pumped
>>> down, the dessicant/dryer replaced, and thoroughly flushed of all that
>> old
>>> lubricant. If you have an OEM compressor, it should be drained and
>> flushed,
>>> and new lube filled. If you don't flush and replace the lube, be
>> prepared
>>> for a system full of sludge.
>>> Jim Hupy
>>> Salem, Oregon
>>>
>>>> On Sat, Jul 17, 2021, 5:17 AM dave silva wrote:
>>>>
>>>> This coach was restored in 2013 and then sat for seven years. I've been
>>>> slowly recommissioning it.
>>>>
>>>> The AC worked. Now it doesn't. Apparently a very slow leak. It has
>> no
>>>> pressure but it holds vacuum.
>>>>
>>>> It had been converted to R134. I have a case of duracool.
>>>>
>>>> So what do i need to know besides adding duracool and crossing fingers
>> ?
>>>>
>>>>
>>>> --
>>>> Dave & Ellen Silva
>>>> Hertford, NC
>>>>
>>>> 76 Birchaven, 1-ton and other stuff
>>>>
>>>> Currently planning the Great american Road Trip Summer 2021
>>>>
>>>> It's gonna take a lot of Adderall to get this thing right.
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365488 is a reply to message #365483] |
Sat, 17 July 2021 10:42 |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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Senior Member |
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James
I still have to disagree with you on this.
If you go to www.duracool.com in their technical facts area you will find the statement “compatible with mineral and synthetic oils including PAG and ester oils”.
I am very familiar with PAG and I have been installing Duracool in GMC Motorhome for many years including conversions to R134a and have had no problems with Duracool and PAG oil.
Not sure when you had GM training school but I don’t think Duracool was around way back then.
Emery Stora
> On Jul 17, 2021, at 9:09 AM, James Hupy wrote:
> The one oil that both refrigerants ARE compatible with is called POE,
> which is Polyol Ester Oil.
> If, when the R-134a was introduced into Dave's GMC that oil was used, then
> HC-12a can be added to replace R-134a with no ill effects. Just Sayin, that
> is a big IF.
> Jim Hupy
> Salem, Oregon
>
> On Sat, Jul 17, 2021, 7:56 AM James Hupy wrote:
>
>> Au Contraire' Emery.
>> R-12 lube is mineral based.
>> R-134a lube is not mineral oil, but is something called PAG which is a
>> synthetic lube. According to the Rules and Laws, R-134a and R-12 cannot be
>> mixed, that goes for HC-12a or "duracool" as well. Emery, you can do as
>> you wish, but those are the facts as I learned them from GM Training
>> School. Still have the books. I went and looked them up. Just what I was
>> taught.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Sat, Jul 17, 2021, 7:05 AM Emery Stora via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> James
>>> Duracool is compatible with the oil used with R12 and also compatible
>>> with the oil used with R134a.
>>> If the system was properly converted for R134a then Duracool can be
>>> installed without changing anything.
>>> Emery STORA
>>> 77 Kingsley
>>> Frederick CO
>>>> On Jul 17, 2021, at 7:49 AM, James Hupy wrote:
>>>> If you have R-134a, and it was professionally installed, they used an
>>> oil
>>>> specifically compatible with that refrigerant. It will NOT BE compatible
>>>> with either R-12 or Duracool type refrigerants. The system must be
>>> pumped
>>>> down, the dessicant/dryer replaced, and thoroughly flushed of all that
>>> old
>>>> lubricant. If you have an OEM compressor, it should be drained and
>>> flushed,
>>>> and new lube filled. If you don't flush and replace the lube, be
>>> prepared
>>>> for a system full of sludge.
>>>> Jim Hupy
>>>> Salem, Oregon
>>>> > On Sat, Jul 17, 2021, 5:17 AM dave silva wrote:
>>>> > This coach was restored in 2013 and then sat for seven years. I've been
>>>> > slowly recommissioning it.
>>>> > The AC worked. Now it doesn't. Apparently a very slow leak. It has
>>> no
>>>> > pressure but it holds vacuum.
>>>> > It had been converted to R134. I have a case of duracool.
>>>> > So what do i need to know besides adding duracool and crossing fingers
>>> ?
>>>> > --
>>>> > Dave & Ellen Silva
>>>> > Hertford, NC
>>>> > 76 Birchaven, 1-ton and other stuff
>>>> > Currently planning the Great american Road Trip Summer 2021
>>>> > It's gonna take a lot of Adderall to get this thing right.
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365490 is a reply to message #365488] |
Sat, 17 July 2021 11:14 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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You are correct, in that I am not too well read on HC-12a. The last time I
attended GM Training School was 1985 or so. HC-12a was verboten in the USA
at that time. Still might be in certified AC shops, which I was. Don't
know if propane based refrigerants are compatible with synthetic
oils except as I already stated. That's all I know about that.
Jim Hupy
Salem, Oregon
On Sat, Jul 17, 2021, 8:43 AM Emery Stora via Gmclist <
gmclist@list.gmcnet.org> wrote:
> James
> I still have to disagree with you on this.
> If you go to www.duracool.com in their technical facts area you will find
> the statement “compatible with mineral and synthetic oils including PAG and
> ester oils”.
> I am very familiar with PAG and I have been installing Duracool in GMC
> Motorhome for many years including conversions to R134a and have had no
> problems with Duracool and PAG oil.
>
> Not sure when you had GM training school but I don’t think Duracool was
> around way back then.
>
>
> Emery Stora
>
>> On Jul 17, 2021, at 9:09 AM, James Hupy wrote:
>> The one oil that both refrigerants ARE compatible with is called POE,
>> which is Polyol Ester Oil.
>> If, when the R-134a was introduced into Dave's GMC that oil was used,
> then
>> HC-12a can be added to replace R-134a with no ill effects. Just Sayin,
> that
>> is a big IF.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Sat, Jul 17, 2021, 7:56 AM James Hupy wrote:
>>
>>> Au Contraire' Emery.
>>> R-12 lube is mineral based.
>>> R-134a lube is not mineral oil, but is something called PAG which is a
>>> synthetic lube. According to the Rules and Laws, R-134a and R-12 cannot
> be
>>> mixed, that goes for HC-12a or "duracool" as well. Emery, you can do as
>>> you wish, but those are the facts as I learned them from GM Training
>>> School. Still have the books. I went and looked them up. Just what I was
>>> taught.
>>> Jim Hupy
>>> Salem, Oregon
>>>
>>> On Sat, Jul 17, 2021, 7:05 AM Emery Stora via Gmclist >> gmclist@list.gmcnet.org> wrote:
>>>
>>>> James
>>>> Duracool is compatible with the oil used with R12 and also compatible
>>>> with the oil used with R134a.
>>>> If the system was properly converted for R134a then Duracool can be
>>>> installed without changing anything.
>>>> Emery STORA
>>>> 77 Kingsley
>>>> Frederick CO
>>>> > On Jul 17, 2021, at 7:49 AM, James Hupy wrote:
>>>> > If you have R-134a, and it was professionally installed, they used an
>>>> oil
>>>> > specifically compatible with that refrigerant. It will NOT BE
> compatible
>>>> > with either R-12 or Duracool type refrigerants. The system must be
>>>> pumped
>>>> > down, the dessicant/dryer replaced, and thoroughly flushed of all that
>>>> old
>>>> > lubricant. If you have an OEM compressor, it should be drained and
>>>> flushed,
>>>> > and new lube filled. If you don't flush and replace the lube, be
>>>> prepared
>>>> > for a system full of sludge.
>>>> > Jim Hupy
>>>> > Salem, Oregon
>>>> >> On Sat, Jul 17, 2021, 5:17 AM dave silva wrote:
>>>> >> This coach was restored in 2013 and then sat for seven years. I've
> been
>>>> >> slowly recommissioning it.
>>>> >> The AC worked. Now it doesn't. Apparently a very slow leak. It has
>>>> no
>>>> >> pressure but it holds vacuum.
>>>> >> It had been converted to R134. I have a case of duracool.
>>>> >> So what do i need to know besides adding duracool and crossing
> fingers
>>>> ?
>>>> >> --
>>>> >> Dave & Ellen Silva
>>>> >> Hertford, NC
>>>> >> 76 Birchaven, 1-ton and other stuff
>>>> >> Currently planning the Great american Road Trip Summer 2021
>>>> >> It's gonna take a lot of Adderall to get this thing right.
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| Re: [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365491 is a reply to message #365490] |
Sat, 17 July 2021 12:05 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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I have to go with Emery on this .25 years ago I converted a hundred ton commercial system from r12 to 134. I replaced gallons of mineral oil with ester oil. Generally you could add duracool to an r12 or 134 system to top it off but it isn’t legal a tech could loose their license doing this not to mention a fine.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365496 is a reply to message #365491] |
Sat, 17 July 2021 17:36 |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
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Senior Member |
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So have we reached a consensus?
I did replace R134 with Duracool in a Ford Expedition and it worked great for several years.
But apart from the dispute over the refrigerant, are there any other steps to resurrecting this system, assuming it is intact?
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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| Re: 76 Birch air conditioning - I'm going in [message #365500 is a reply to message #365499] |
Sat, 17 July 2021 18:16 |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
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Senior Member |
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tgeiger wrote on Sat, 17 July 2021 18:11Kinda preparing to go thru this as well. I have a 76 Eleganza so in the same boat. Did the PO do the recirculation mod on the air box?
No idea.The work was done by the COOP. Not sure what standard options are and i haven't asked Jim B. about the AC
What is the recirc mod and how can i tell ?
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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| Re: 76 Birch air conditioning - I'm going in [message #365509 is a reply to message #365483] |
Sun, 18 July 2021 07:55 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Dave,
You are gambling with $40 worth of duracool.
You can pull a vacuum, make sure it holds that vacuum. Your patience on how long to watch the needle
Drop varies on how
Much you care about $40 or having to add more later. I dont have patience so usually I only hold a vacuum for maybe an hour at
Most,
Most times it is however long i go inside to get something to eat
Or drink.
Then pop on a can, fire up engine. Short out the “high” pressure switch plug so compressor kicks on and let it take that can add the others and then start watching pressures. Get someone to get the rpms up.
You will find your $40 charge will last forever. Or eventually
Might need another $6.99 can someday. I have seen some last and my friend Ed we put
A can in just before summer. This time i think i might know where our leak might be. (Valve core). So will find one and try that.
You could go through alot
Of work and guessing to search out leaks. Chances are $40 worth of duracool will probably keep you cool as needed.
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: 76 Birch air conditioning - I'm going in [message #365510 is a reply to message #365509] |
Sun, 18 July 2021 08:35 |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
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Senior Member |
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lqqkatjon wrote on Sun, 18 July 2021 07:55Dave,
You are gambling with $40 worth of duracool.
Then pop on a can, fire up engine. Short out the “high” pressure switch plug so compressor kicks on and let it take that can add the others and then start watching pressures. Get someone to get the rpms up.
Thanks, that's the info i was looking for.
It actually held vacuum for a long time, like overnight.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365511 is a reply to message #365510] |
Sun, 18 July 2021 09:20 |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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Senior Member |
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Jon
How would it be a $40 charge. If you use the recommended 3 cans at $6.99 per can it would be a $20.97 charge? If you put in $40 worth you are overcharging the system.
Emery STORA
> On Jul 18, 2021, at 7:36 AM, dave silva wrote:
>
> lqqkatjon wrote on Sun, 18 July 2021 07:55
>> Dave,
>>
>> You are gambling with $40 worth of duracool.
>>
>> Then pop on a can, fire up engine. Short out the “high” pressure switch plug so compressor kicks on and let it take that can add the others
>> and then start watching pressures. Get someone to get the rpms up.
>
> Thanks, that's the info i was looking for.
>
> It actually held vacuum for a long time, like overnight.
>
>
> --
> Dave & Ellen Silva
> Hertford, NC
>
> 76 Birchaven, 1-ton and other stuff
>
> Currently planning the Great american Road Trip Summer 2021
>
> It's gonna take a lot of Adderall to get this thing right.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365512 is a reply to message #365509] |
Sun, 18 July 2021 09:31 |
Dave Stragand
Messages: 307
Registered: October 2017
Karma: 0
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Senior Member |
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One of my favorite tools is the Mastercool 91490 Schrader valve core installer tool. It allows you to change a valve core while maintaining pressure in the system. I’ve used it for more than a few repairs and for some reason I am just fascinated by the ingenuity of the tool. https://www.mastercool.com/ /91490
-Dave
1978 Transmode near Pittsburgh
On Jul 18, 2021, at 8:56 AM, Jon Roche wrote:
This time i think i might know where our leak might be. (Valve core). So will find one and try that.
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1978 Transmode (403)
Pittsburgh, PA
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| Re: [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365513 is a reply to message #365511] |
Sun, 18 July 2021 10:10 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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3 cans of genuine duracool were just dropped on my doorstep yesterday. I am going to evacuate the “frostycool 12a”
I have a case or more left if frostycool.
My new vintage air setup seems to tend to blow not as cold over time. Not sure why, i have adjusted charge up and down. I dont think it is freezing up, with looking in with boroscope i dont see any frost problem.
Friend who does home hvac work for a living, but also had done gmc air, claims to only use genuine duracool and he experienced poor cooling from another non-duracool r12a, and now will only reccomend genuine duracool.
The frostycool seems to work well for others vehicles and my friend ed’s stock gmc. So the non-scientific opinion is difference on how the mixtures effect pressures for the expansion valve.
So for $40, I am going to see if genuine duracool works better. I can report after next week.
$6.99 a can. X3. + $10.66 shipping was $37.65. I rounded up.
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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| [GMCnet] Re: 76 Birch air conditioning - I'm going in [message #365514 is a reply to message #365513] |
Sun, 18 July 2021 12:30 |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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Senior Member |
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It’s amazing how much shipping adds to the cost nowadays!
Emery STORA
> On Jul 18, 2021, at 9:10 AM, Jon Roche wrote:
>
> 3 cans of genuine duracool were just dropped on my doorstep yesterday. I am going to evacuate the “frostycool 12a”
> I have a case or more left if frostycool.
>
> My new vintage air setup seems to tend to blow not as cold over time. Not sure why, i have adjusted charge up and down. I dont think it is
> freezing up, with looking in with boroscope i dont see any frost problem.
>
> Friend who does home hvac work for a living, but also had done gmc air, claims to only use genuine duracool and he experienced poor cooling from
> another non-duracool r12a, and now will only reccomend genuine duracool.
>
> The frostycool seems to work well for others vehicles and my friend ed’s stock gmc. So the non-scientific opinion is difference on how the
> mixtures effect pressures for the expansion valve.
>
> So for $40, I am going to see if genuine duracool works better. I can report after next week.
>
>
>
> $6.99 a can. X3. + $10.66 shipping was $37.65. I rounded up.
>
>
>
> --
> 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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