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Originally Posted by twochaps
He said he only needed to vacuum out the old stuff, install a couple of new couplings and then add the new R134 or whatever it is called. Question: Can or should this be done without ruining the old A/C system?
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Yes what he said is true. BUT, in a year or 2 you will be replacing the compressor and flushing the system due to a compressor failure.
Read this, it's called "black death"
http://www.ackits.com/index.cfm?fuseaction=black%20death
So yes you can install R134A cheaply but you will pay for your mechanics lousy work later.
Keep the car R12 if you can. If the car has "some " freon pressure, have the system evacuated, test the system for leaks, It should hold the vacuum for 30-45 minutes. If it does then you have slowly leaked the freon. 1/2 lb. leak a year is acceptabe, not good, but acceptable. If the system holds the vacuum then have the proper amount of R12 installed, I would include a dye for any future leak checks.
Dave
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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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