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Hot weather has arrived with a vengence in the south west and the A/C on my 92 900 has been flakey. Yesterday I turned it on and it got cold within 2-3 minutes, no worries! Today it didnt cool at all.Cycling the A/C switch a few minutes later I could feel the compressor clutch engage and air became cold within a few minutes.... According to the trusty Bentley manual there are several switches which control the power applied to the compressor ie.clutch engagement. The pressure switch in the receiver/ drier was a suspect since the system hasnt been charged in the last 3 years and has worked great until now or I should say it works well when it works! To make a long story short!! After testing the continuity of the pressure switch according to Bently..It failed the test,leading me to believe that the system was low on freon or the switch had failed.I took the car to a good local A/C shop and yes the freon was low and the condensor dirty.They added 1 3/4# lbs. of freon! I guess it was really low [$48.00 lb for R-12] After a recharge the system seems to work well...Now the questions!! Bentley dosnt explain; but does the pressure switch protect the compressor from a complete re-frigerant loss or could a low freon level cause my intermittant problem which at present seems to be solved. It seems that if the system pressure was low ie. at the threshold of closing the switch then the compressor would then be cycling Hmmmm!Should a system cycle during normal operation? and if so what cycles the compressor. Something I learned today from the A/C tech was that r-12 breaks down with normal usage roughly 1/2 pound per year Is this true? Everything else breaks down why not R-12!!!The tech furthered that due to this it is advisable to evacuate the system and recharge every few years...Is this true? why do refridgerators seem to go forever?? I guess the loss of cooling can be a combo of leakage and R-12 break down. Another word of encouragement from the tech was that a coil in the compressor can cause similar clutch engagement problems as I am experiencing. If a compressor is needed it sounds like a resonable time for a conversion to R-134.Can you get good results using the existing condenser which I have heard is a limiting factor on cooling performance? It didnt sound like a big problem to convert the system. Any comments would be appreciated TIA jk
posted by 152.163.20...
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