R134 pressure/refill
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Lead Driver
Joined: Nov 2000
Posts: 6,640
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From: Albuquerque
R134 pressure/refill
My system was converted to R134 10 years ago but doesn't cool as well as it used to. What kind of pressures should I look for?
How about the refill cans with leak stop in them? Bad idea? Oil?
How about the refill cans with leak stop in them? Bad idea? Oil?
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
Heres are the pressures for normal functioning systems
these are all at 90* Ambient Temp.
High Side Pressure :
200 - 310 psi
Low Side Pressure :
(STV, POA, or VIR systems) 28 to 31 psi
(Expansion valve Systems ) 7 to 15 psi
(Orifice Tube Systems ) 24 to 32 psi
The leak fill will work for small leaks but if its a fairly large leak its a waste. Plus I have seen in some instances where it fouls up the a/c compressior.
For oil, you only add oil when oil comes out of it. But if you dont know how much oil was in there to begin with you could add half of the recomended to be safe.
these are all at 90* Ambient Temp.
High Side Pressure :
200 - 310 psi
Low Side Pressure :
(STV, POA, or VIR systems) 28 to 31 psi
(Expansion valve Systems ) 7 to 15 psi
(Orifice Tube Systems ) 24 to 32 psi
The leak fill will work for small leaks but if its a fairly large leak its a waste. Plus I have seen in some instances where it fouls up the a/c compressior.
For oil, you only add oil when oil comes out of it. But if you dont know how much oil was in there to begin with you could add half of the recomended to be safe.
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
If it has been 10 years since it has been serviced you should replace the filter/drier & pull a vacuum and recharge. If you ever put in anything like stop leak it maybe impossible to find a shop to work on it. That stop leak messes up their recovery systems and most shops check to see if there is any in the system with a special meter.
I'm ASE certified on A/C systems along with I hold a Type I & II EPA cert also.
I'm ASE certified on A/C systems along with I hold a Type I & II EPA cert also.
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propellerhead
Cooling, Heating, Ventilation & A/C
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Jul 28, 2003 12:07 AM
