Jeff, what is the temperature of the air coming out of the vents above the windshield after you have been put on the highway for a while? John Lauterbach Macon, GA '84 7-passenger ----- Original Message ----- From: "Jeffrey Schwaia" <jeff@TSSGI.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, June 05, 2003 2:14 PM Subject: Re: Converting to R134
> Sam, > > I just did another one of these this week. Pretty basic... > > -I always replace the receiver/drier, expansion valve and all O-rings. > > -Pull the compressor and let it drain for about 30 minutes. > > -If the system has been open for any length of time you should flush the > system with A/C cleaning fluid. > > -Re-assemble everything with new O-rings and liberal amounts of esther oil. > > -Evacuate the system for at least 30 minutes, make note of the readings on > the gauges. > > -Let it sit for at least 30 minutes, check the gauges to make sure it held > the vacuum (i.e., the readings didn't change). > > -Add freon till the high side reads ~250psi with the A/C on and the engine > running at ~2000RPM. Low side pressure should be ~35psi. > > -Turn off the A/C and let it sit for a few minutes, the high and low side > pressures should equalize. > > -Button it all back up and drive down the road with the windows up! ;-) > > > BTW & IMHO, the downside to R-134 (other than its inferior cooling ability) > is the amount of power it robs from the engine when compare to R-12. An > R-12 system operates at a lower pressure than the R-134 system, which means > the engine does not have to work as hard to turn the compressor. The vans > I've converted had a noticeably less power with R-134 than they had with > R-12. Perhaps it's just me... > > > Cheers, > > Jeff |
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