Date: Sat, 31 Mar 2001 17:47:28 GMT From: "RWS_1" <lilpickles1nopsam.com> Subject: Re: PLEASE HELP AC
RCS's is correct by stating the chances are very likely that the low pressure shut off switch has shut down your system due to low pressure (or no pressure). But, NEVER CHARGE A R-12 FREON SYSTEM WITH R-134a. First, the oils in the R-134a are NOT compatible with the rubber o-rings throughout the R-12 system. The R-134 will destroy the o-rings and you'll never hold any pressure (any Napa auto parts store could show you the difference in R-12 and R-134a o-rings). Second, R-134 will not work as effectively when compressed with a R-12 compressor (not to mention the R-134 could damage the seals in the compressor also). You may consider converting the system completely to R 134a. If your compressor is bad it's a no brain'r, -- convert the entire system. If your R-12 compressor's got 140,000 or more miles on it, you may consider it due to the cost of R-12 and the useful life left in a 140k compressor. R-12 in my area is going for about $60/pound. R-134 is less than $5. My Saab only takes about a pound and a half (only compare to my MB that takes 3lbs to fill). On my 1988 900spg, my compressor when out at 145k. I purchased a 134a compatible compressor for about $325. I disassembled the entire system and flushed it, changed every o-ring, replaced the expansion valve and dryer. Doing the entire conversion myself for about $400, the system has been producing ice cold air every since (ice cold meaning I can see my breath when breathing into a blowing vent). R-134a is not as efficient as R-12. What I mean is that it requires the tighter tollarences of the R-134a compatible compressor to be just as effective in cooling compared to a R-12 system. If you do this conversion, don't forget to have any remaining R-12 removed and contained by a Pro prior to starting the procedure. Another consideration is that if your system has been inop for an extened period of time, chances are your o-rings are completely dryed out, usless, and have zero chance of holding any system pressure. After it's fixed run your A/C system at least once a month throughout the winter. Use it or loss it. good luck "RCS" <e9225126nopsam1.tuwien.ac.at> wrote in message news:3AC33F95.8000508nopsam1.tuwien.ac.at... > Sorry NO!!! There¥s a protection switch that indicates low freon gas > pressure. So it always quits its job abbrubtly! > Have you ever refilled the AC gas? If no, you can be lucky and have the > system refilled BY AUTHORIZED PERSONS!!! NEVER try to fix anthing at you > AC by yourself!!! > Be sure to add some contrast fluid when refilling the system so someone > can determine the bad part. (using UV-light...) > On my 900TConv (93) the evaporator has a (very very small) leak and the > freon gas disappears over 1 - 1.5 years... I had refilled it twice (with > R134 ?or so, that's better for the ozon layer but disappears faster!) > Maybee the anti freezing sensor was not well connected to my evaporator > and so it was damaged - one of the theories that were told to me... > > ANYWAY - it¥s a difficult job to find the damaged part! > You can check the safety (pressure) switch with a multi meter, it¥s > located at the right front fender at the AC valve (follow the AC hoses) > it has to be closed! > Otherwise - search for a good AC-shop (maybee you find some better guys > than you SAAB garage - be professional take professionals!) and have the > AC system refilled (serching for leaks) > > I wish you luck, greetings, RCS > > Babu wrote: > > > Actually, what I would like to know is...which one should I try to replace > > FIRST? > > Is there a higher likelyhood that one goes out more often than the other? > > I'm assuming that since the AC went out overnight it's a high likely hood > > that it's > > one of these relays...please tell me I'm right. > > > > Babu > > > > > > Babu <dewanopsamell.net> wrote in message > > news:Oreu6.20748$qv3.8025686nopsam5-w.sbc.net... > > > >> My 91 900 Turbo suddenly lost the air conditioning > >> overnight. I found two "relays" and a fuse which was > >> good (switched anyway). Can anyone please tell me > >> what these couple of relays do and if they are costly. > >> Would anyone recommend just replacing in order to > >> rule that out? > >> > >> Thanks In Advance, Babu > >> > >> > >> >
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