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Originally Posted by Ron in SC
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I just installed a new compressor, expansion valve and receiver/dryer in my 92 300E. I now get 39 degrees at the vents with outside ambient at 80 degrees while driving. When I charged the system at idle ( ambient 95-100 degrees F) my high pressure side was 245 psi and the low pressure side was 39 psi. vent temp. in the car at idle was 55 degrees F. on the highest setting. I put in very close to 2.1 lbs. of R134a (vehicle had been converted from R12). The system held 2.4 lbs. of R12.
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I just topped off my 1991 300TE that had been retrofitted to R134.
I now have 40 psi on the low side at 91F ambient temp at idle.
Our numbers sound close.
Just wanted to chime in here, because I'm not sure 40 psi is exactly right, but when I got to about 36 psi or so my aux fans came alive, and I have nice cold AC... 
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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic
Last edited by Robert W. Roe; 07-19-2005 at 09:23 PM.
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