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notsobrite on Fri June 26, 2009 6:48 PM User is offline

Year: 1994
Make: oldsmobile
Model: cutlass ciera
Engine Size: 3.1
Refrigerant Type: 134a
Ambient Temp: 85
Country of Origin: United States

Hi. I have been reading about automotive ac problems and procedures. It seems that the most appropriate way to charge a 134a system is to deep vacuum it and add refrigerant by weight. I don't know what the proper weight is for the above car. I looked in my haynes manual and in the engine compartment without finding it. Is this info available anywhere on line for this (and other cars)? Does anyone know the weight? with an ambient temp of say 85, where can i find the appropriate low and high side readings for a fully charged system? thanks

HVargas on Fri June 26, 2009 6:55 PM User is offlineView users profile

36oz

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TRB on Fri June 26, 2009 6:57 PM User is offlineView users profile

28 ounces of R134a

Low: 26 PSI
High: 200 PSI

80 degree ambient @ 1500 RPM.

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Contact: ACKits.com

HVargas on Fri June 26, 2009 7:03 PM User is offlineView users profile

28oz is correct. I clicked all makes by mistake.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: Arizona Mobile Air

notsobrite on Fri June 26, 2009 7:10 PM User is offline

Clicked all makes on what site??

TRB on Fri June 26, 2009 7:49 PM User is offlineView users profile

We use a program for the auto industry and it cost about $200.00 a month. NAPA has a pdf listing that is fairly accurate. I have a link to it in the tips section.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

notsobrite on Fri June 26, 2009 8:27 PM User is offline

Thank you very much for your help

Edited: Fri June 26, 2009 at 8:28 PM by notsobrite

notsobrite on Sat June 27, 2009 9:30 AM User is offline

Sorry, I keep clicking on reply before I type message. Anyway. I am pretty excited this morning. This is my first experience with auto ac (even though i am an old guy). After spending some time with the Mastercool service manual and getting the above advice from you guys, I vacuumed the system several times last night (with 10 min delays between vacs as per TRB's earlier post on this site) It held at about 29.5 overnight. I added two 12 oz cans of 134a (the first of which contained one oz of oil). right now i have the following...at somewhere near 1500rpm low 26 psi high 178 pdi temp at center vent low fan doors/windows closed 43.5 degrees F. Now for the questions. System is supposed to have 28 oz. I am filling from 12 oz cans. Do i leave well enough alone and stop where i am? Do i put in 4 oz and just guess how much has gone in? If you tell me to stop right now I would still like to know if there is an accurate way to add amount from small can. thanks for your help

daman on Sat June 27, 2009 10:44 AM User is offlineView users profile

Your going to need a touch more,i weigh my cans before and after and they actually only fill around 11.5-to 11.8 oz(for me atleast),then what ever is trapped in the hoses,so you need at least 4 more oz's min if not a tad bit more,my last can i weight it with the can tap(obviously) on then i shoot some in weight it shoot some in weight it till im at factory spec.

get your slef a nice postal scale that reads Oz's,thats what i use really helps in doing this with 12oz cans

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Edited: Sat June 27, 2009 at 10:50 AM by daman

notsobrite on Sat June 27, 2009 12:16 PM User is offline

Thanks for the help. Called all over my home town without finding one. I will order one on line. I guess it will be ok to use the ac until i get it and add the 4 oz's??

daman on Sat June 27, 2009 12:55 PM User is offlineView users profile

If it's a v5 i'm sure??? they don't like to be ran low on charge,134a carries oil,i would use it only when necessary.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

notsobrite on Sat June 27, 2009 1:24 PM User is offline

Help. I tried to use old fashioned food scale and probably got too much in. now low reads 48 and high 195. what do i do

daman on Sat June 27, 2009 1:29 PM User is offlineView users profile

How much did you put in you think?? is that at 1500?? what ambient?

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

notsobrite on Sat June 27, 2009 1:34 PM User is offline

I put in the first 2 cans then i"m guessing maybe 8 oz of third can which would put me around 32 oz. ambient temp around 84 now. I tried to rev to guesstimate 1500 for a while during reading but shut off out of fear of damaging compressor. Hard to weigh can during procedure with hose on it and balancing on rinky dink scale. Should have waited until i could get a better one.

Edited: Sat June 27, 2009 at 1:40 PM by notsobrite

daman on Sat June 27, 2009 1:49 PM User is offlineView users profile

Quote
Originally posted by: notsobrite
I put in the first 2 cans then i"m guessing maybe 8 oz of third can which would put me around 32 oz. ambient temp around 84 now. I tried to rev to guesstimate 1500 for a while during reading but shut off out of fear of damaging compressor. Hard to weigh can during procedure with hose on it and balancing on rinky dink scale. Should have waited until i could get a better one.
i would call it more like 5-6 because theres always some stuck in the hoses,and that would put you closer to your 28-29 required oz's needed,i think your fine now, i remove the can off the center yellow hose after filling, weigh the can(with can tap) then put it back on the hose add more etc etc.



-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

TRB on Sat June 27, 2009 1:52 PM User is offlineView users profile

Should have pressures close to 28/200 @ 80 degrees ambient with a full system charge. If there is no air in the system I would be looking for air flow issues. Has anyone added any oil to this system? Might consider reclaiming the refrigerant and inspecting the orifice tube.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

notsobrite on Sat June 27, 2009 2:09 PM User is offline

holy crap. i was missreading the high side. it is at about 470. is shut it down. i need to admit that i bled a little on the low side initially. this may have caused the probleml. I am thinking maybe i need to start over with the vacuum procedure. and read the right end of the needle by the way, ambient temp is up to 92

Edited: Sat June 27, 2009 at 2:11 PM by notsobrite

notsobrite on Sat June 27, 2009 2:16 PM User is offline

the first can i added had 1 oz oil. i don't know anything about the history of this ac system. just bought this old junker. i think the readings were close the first time but not absolutely sure if i was looking at the right end of the arrow. that is why i wonder about starting over. by the way. what do i look for in inspection of orifice tube? earning the name, notsobrite

Edited: Sat June 27, 2009 at 2:20 PM by notsobrite

daman on Sat June 27, 2009 2:25 PM User is offlineView users profile

that it looks clean and no shavings on it,,sounds like your going to need to reclaim and start over.

how is air flow over the condenser like tim asked" fan working good? shields all in place??

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

notsobrite on Sat June 27, 2009 2:31 PM User is offline

fan working and i believe shields are in place. I think i will vacuum right away. carefully recharge when i get a better scale. I'll be back in a few days. thanks

daman on Sat June 27, 2009 2:56 PM User is offlineView users profile

Don't forget to check the O tube,just replace it there only a few bucks..

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

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