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04-21-2008, 07:06 AM
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#1 |
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Registered User
Join Date: May 2007
Location: Moore, Oklahoma
Posts: 2,396
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Denied ! (ac still not cold)
Wel, i put some r-134 service fittings on my compressor and voila! Low side pressure is at 60 and its still not getting cold
Anything else that can go wrong with these things? I have a giant York compressor that does not appear to have a clutch on the front, so i dont know if its engaging or not, or if its always engaged --- for now its lookin like 2 wasted cans of refrigerant pic of compressor --- 
__________________
Are you retired too? Nonsense! I'm in my prime |
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04-21-2008, 07:35 AM
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#2 |
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Registered User
Join Date: Aug 2007
Location: West Hills, California
Posts: 679
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Re: Denied ! (ac still not cold)
All r134 systems that I seen have about 25-30psi on the low side. Almost sounds like there is a restriction somewhere.
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04-21-2008, 01:23 PM
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#3 |
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mini truck racer
Join Date: Aug 2006
Location: Baytown , texas
Posts: 3,010
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Re: Denied ! (ac still not cold)
28 # is the freezing point for R-134A . In the picture there is no belt . Also looks like there could be a wiring problem . It appears the clutch wire has a wire nut on it . Might make sure you have power to the clutch . For safety reasons always make sure you monitor the high pressure side of the system as well when charging .
__________________
1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583 |
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04-21-2008, 05:00 PM
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#4 | |
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Registered User
Join Date: May 2007
Location: Moore, Oklahoma
Posts: 2,396
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Re: Denied ! (ac still not cold)
Quote:
did not know about the 28# freezing point -- the 12-134 conversion instructions stated to pressure it to 50-55# at 80 degrees outside air.
__________________
Are you retired too? Nonsense! I'm in my prime |
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04-21-2008, 05:05 PM
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#5 |
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Registered User
Join Date: Nov 2006
Location: lafayette, ga.
Posts: 832
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Re: Denied ! (ac still not cold)
you have been giving proper info. check you pressure switches, checked fuses and relays. get the low side between 30 and 40 psi and the top side should take care of itself. remember dont use as much 134 as you would 12
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 Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream.It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan |
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04-21-2008, 06:05 PM
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#6 |
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mini truck racer
Join Date: Aug 2006
Location: Baytown , texas
Posts: 3,010
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Re: Denied ! (ac still not cold)
The 28 # s is directly from the pressure to temperture chrt for 134 A . anything below that and the evaporator will try to freeze . to much suction pressure will result in high suction super heat or liquid flood back . Your compressor cannot pump liquid .
Also on top of the liquid line filter/drier ( passenger side fender well ) is a sight glass . You may have to clean it with a rag and maybe add a drop of oil to the glass , but you should see refrigerant moving through this glass . If you have a fixed restricter you may see some vapor in it when fully charged . Go by your pressures . If discharge gets above 275 and you still have low suction you more than likely have a problem . If it is an expansion valve system that has been open for some time it may have a stuck valve due to moisture .If i am not mistaken the front of that compressor will be spinning when the clutch is engaged .
__________________
1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583 Last edited by hotrod 80; 04-21-2008 at 06:14 PM. |
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04-21-2008, 10:11 PM
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#7 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Denied ! (ac still not cold)
The dryier is on the fender well can you see liquid running through it or is it just sitting there. I wouldn't trust those two radiator clamps on the black hoses either. Quick way to check compressor is run a jumper to the compressor straight to the battery see if it comes on. Then you know there is a problem in your wiring some place.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71  Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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04-22-2008, 02:22 AM
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#8 |
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Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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Re: Denied ! (ac still not cold)
On a York, if the middle of the pulley is turning the clutch is engaged, if it's stationary it's not. I run a 209 for my suspension.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
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