Re: R134a AC Low Side Pressures (duandcc)
Nobody knows anything about AC?
Nobody knows anything about AC?
R134a AC Low Side Pressures
Does anybody know what the proper low side pressures would be for an automotive AC system that has been converted from R12 to R134a? Or know where I can get a chart of pressure versus ambient temperature for a properly charged system?
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Re: R134a AC Low Side Pressures (duandcc)
I think I remember your air conditioning plight a while ago. I looked at the service manual for my Audi and it said the low-pressure valve would cut off the A/C system if the pressure was below 1.1 bar (16psi absolute). It never said what a normal charge would be, but it said that the valve would close a circuit (i.e. normal operation) in the range of ~2bar to ~2.6bar, which is somwhere around 30 to 40 psi absolute.
Bottom line: if it's below atmospheric pressure (1bar), it's too low.
quote:[HR][/HR]Nobody knows anything about AC?[HR][/HR]
Well, this IS the car lounge (damn, I've been here too long if I start to sound like another car lounge cynic).I think I remember your air conditioning plight a while ago. I looked at the service manual for my Audi and it said the low-pressure valve would cut off the A/C system if the pressure was below 1.1 bar (16psi absolute). It never said what a normal charge would be, but it said that the valve would close a circuit (i.e. normal operation) in the range of ~2bar to ~2.6bar, which is somwhere around 30 to 40 psi absolute.
Bottom line: if it's below atmospheric pressure (1bar), it's too low.
1 - 3 of 3 Posts
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