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Date: Tue, 10 May 2005 03:20:33 GMT
From: "Walt Kienzle" <wkienzle.nospamnospamlobal.net>
Subject: Re: 89 900 A/C Question


"Monte S Minthorne" <minthornemnospamast.net> wrote in message news:55GdnQsF6P0fjx3fRVn-vAnospamast.com... > Hello, > I am new to this news group as well as a relatively new owner of 89 900 > convertible. My question if you would be so kind in answering is, has > anyone swapped out the Air Conditioner on a 900 to use the freon R-134a > instead of the R-12 that it was originally equipped with? How big of a > pain is it? Did you use a kit? Or do you just pay the $100 a pound or so > for the R-12? The A/C is currently not working but my intentions are to > keep this car as long as possible so I would like to get it working just > in case. > Thanks for your time and consideration in this matter. > Respectfully - Monte > Paying $100 a pound is not very cost effective. If you want to keep the car for awhile with working A/C, my opinion is to convert. Just keep in mind that the effectiveness (cooling power) of the A/C system is somewhat reduced when R-134a is used in a system designed for R-12. Most kits consist of a few cans of R-134a (with lubricant), a valve to open the cans and fill the system, and adapters for the high and low pressure ports on the A/C system which indicate to anyone servicing the car in the future that it is equipped with R-134a. One of the issues with switching from R-12 to R-134a is that a different lubricant is needed. The lubricant for R-134a often causes compressors designed for use with R-12 to wear a bit sooner. This might not really be a problem if you need to replace your compressor to effect the repair since all compressors recently manufactured (or remanufactured) are designed to work with R-134a.. If you must replace the compressor (or any other major component of the A/C system) you should probably replace the Receiver/Drier too. New compressor warranties usually require this. You might also want to replace the expansion valve while you have the system open. They sometimes get gummed up, and you don't want to open the system again for this relatively inexpensive part. Before you open the system, you may want to check that the fuse for the A/C system is still good. On my 9000 the radiator fan associated with the A/C system sometimes binds, overloads the circuit and opens the fuse. The same fuse operates the compressor, so the entire A/C system shuts down -- with the ACC fan still going at full speed. I just give the fan a turn by hand and it usually keeps working properly for the rest of the summer. I hope you find this information/opinion helpful. Walt Kienzle 1991 9000T

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