Home » Public Forums » GMCnet » Duracool problem (GMC parts chaser)
| Duracool problem [message #140609] |
Tue, 23 August 2011 09:09  |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
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Went to add some duracool to my 91 probe. AC not working. Noticed the clutch would kick in and shut off after 4-5 seconds. Classic low refrigent symtom. Hooked up the gauges and had 71-72 pounds,,,,??? thats odd. When it leaked out of this car before it would be lower. Fired it up and turned on the AC to max,max fan and the clutch kicks in but the pressure goes UP!!!! Shuts off about 4-5 sec. Pressure rises to about 95. Holy cow. Never seen that before. Usually when this car was low the static pressure would be 30-50 and drop to 8-15 when the clutch would cycle bumping on the low pressure switch. Only thing I can think of is its full and has a blockage after the ac compressor. What do you think,,,,thanks,,,PL
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| Re: Duracool problem [message #140632 is a reply to message #140609] |
Tue, 23 August 2011 11:53  |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Hard to tell much with the suction pressure 4-5 seconds is not enough time. Does this car have a high pressure cutout on the discharge? If so it may be cycling the clutch. What could cause this could be air in the system from the last time it was charged or possibly a plugged dryer or flow rater.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: Duracool problem [message #140660 is a reply to message #140635] |
Tue, 23 August 2011 15:50 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Do not get mad at me, but are you sure you are looking at the LOW side? It really sounds like you are connected to the high side with your gauge and you need more Duracool in the system.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Duracool problem [message #140676 is a reply to message #140660] |
Tue, 23 August 2011 17:43 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
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| Ken Burton wrote on Tue, 23 August 2011 15:50 |
Do not get mad at me, but are you sure you are looking at the LOW side? It really sounds like you are connected to the high side with your gauge and you need more Duracool in the system.
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the low side is the larger size tube. the cycling switch is actually located on the high pressure or smaller tube.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: Duracool problem [message #140747 is a reply to message #140676] |
Wed, 24 August 2011 03:39 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| fred v wrote on Tue, 23 August 2011 17:43 |
| Ken Burton wrote on Tue, 23 August 2011 15:50 |
Do not get mad at me, but are you sure you are looking at the LOW side? It really sounds like you are connected to the high side with your gauge and you need more Duracool in the system.
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the low side is the larger size tube. the cycling switch is actually located on the high pressure or smaller tube.
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I agree. It sounds like the gauges are connected correctly.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Duracool problem [message #140752 is a reply to message #140747] |
Wed, 24 August 2011 07:05 |
John Sharpe
Messages: 489
Registered: February 2006
Location: Texas
Karma: 1
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| Quote: |
....... Fired it up and turned on the AC to max,max fan and the clutch kicks in but the pressure goes UP!!!! Shuts off about 4-5 sec. Pressure rises to about 95. Holy cow. Never seen that before. Usually when this car was low the static pressure would be 30-50 and drop to 8-15 when the clutch would cycle bumping on the low pressure switch. Only thing I can think of is its full and has a blockage after the ac compressor. What do you think,,,,thanks,,,PL
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If things don't compute, you will need to monitor the high pressure side also in order to easily detect refrigerant blockage.
John Sharpe
Humble,TX
'78 Eleganza TBI
'89 Spectrum 2000 MPI V-10
'40 Ford Panel Delivery TPI
johnasharpe@gmail.com
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| Re: [GMCnet] Duracool problem [message #140754 is a reply to message #140609] |
Wed, 24 August 2011 07:09 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Paul,
You will get very high pressure on the low side on a hot day if there is no
air movement past the condenser. Some of those cars rely on ele fans and if
the fan isn't working, you would have those symptoms.
On Tue, Aug 23, 2011 at 7:09 AM, Paul Leavitt <leavittpaul@yahoo.com> wrote:
>
>
> Went to add some duracool to my 91 probe. AC not working. Noticed the
> clutch would kick in and shut off after 4-5 seconds. Classic low refrigent
> symtom. Hooked up the gauges and had 71-72 pounds,,,,??? thats odd. When it
> leaked out of this car before it would be lower. Fired it up and turned on
> the AC to max,max fan and the clutch kicks in but the pressure goes UP!!!!
> Shuts off about 4-5 sec. Pressure rises to about 95. Holy cow. Never seen
> that before. Usually when this car was low the static pressure would be
> 30-50 and drop to 8-15 when the clutch would cycle bumping on the low
> pressure switch. Only thing I can think of is its full and has a blockage
> after the ac compressor. What do you think,,,,thanks,,,PL
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Steve Ferguson
Sierra Vista, AZ
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| Re: Duracool problem [message #140767 is a reply to message #140609] |
Wed, 24 August 2011 08:57 |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
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Ok,,,,thanks for the responses. Ken,,,,checked this morning and the gauges were hooked up corectly. Steve,,,,the pressure rose istantly from 71-72 to 95 in about 4 seconds. Elctric fan was runnin. iInside (evap) and out(cond.). Still stumped. Thought I might run it and tap on the ex. valve (if its got one) but it looks like its inside. Might have an oriface tube(?),,,,haven't goten a chance to look at the factory manual. Working on selling one house, purchaseing another. I've got over 8 acres of grass to cut at 3 locations(son just left fo quatar) and 2 broken riders,,,,man,,,,PL
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| Re: [GMCnet] Duracool problem [message #140797 is a reply to message #140767] |
Wed, 24 August 2011 15:26 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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And all those junk yards to visit.
Now you know what retirement's like! :-)
Ken H.
On Wed, Aug 24, 2011 at 9:57 AM, Paul Leavitt <leavittpaul@yahoo.com> wrote:
> ...haven't goten a chance to look at the factory manual.
Working on selling one house, purchaseing another.
I've got over 8 acres of grass to cut at 3 locations(son just left fo
> quatar) and 2 broken riders,,,,man,,,,PL
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Ken Henderson
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www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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