Subject: That is one of the COMMON leak points... Author: johnhstein as johnhstein, 85-M6CSi, 85 745i (moderator) : member since July, 2004 : 688 posts Posted on: 2010-03-15 18:32:31

the other is the compressor seal. so if the compressor /compressor pulley area shows signs of oil... the compressor seal is shot, and imho, you are in for a new pump again imho, don't use a rebuilt cause the old cases are worn and don't last long...

Next question R12 or 134A hmmm lots of opinions here... but you can only find 134a pumps these days, but I'd certainly consider charging it with a r-12 substitute such as Frost King or Freeze 12 .. lots of scare stories out there about the flammability of substitutes, lots of it is old stuff or hyped to sell their product.. basically they show the "freon burning', but actually it is the oil mist in the spray that is burning. FWIW.. you can throw a burning rag into a can of jet fuel, but it will not flash, but make it a fine mist.. and yes.. it burns quite nicely thank you.

Remember, the 134a evap valve is different than the r12, there are different seals and also the differential pressures of operation are different. 134a operates at a much higher pressure than r12

Regards

John Stein, ATP, Retired Flight Test Pilot

• AC fix and correct R12 expansion valve? (url) - cjarvis 2010-03-15 13:07:04 (398 views)
  • That is one of the COMMON leak points... - johnhstein, 85-M6CSi, 85 745i 2010-03-15 18:32:31 (347 views)
  • Re: AC fix and correct R12 expansion valve? - Hitmanx 2010-03-15 18:29:02 (731 views)
    • I agree.. r-12 if you can find it or - johnhstein, 85-M6CSi, 85 745i 2010-03-15 18:34:08 (321 views)
      • Great advice.. - cjarvis 2010-03-16 12:00:42 (311 views)
        • Re: Great advice.. - Hitmanx 2010-03-16 20:51:11 (333 views)
  • Re: AC fix and correct R12 expansion valve? - limeyexpat 2010-03-15 16:22:45 (327 views)
    • Al Gore will unleash ManBearPig upon you! (nt) - Vern 2010-03-15 20:51:52 (295 views)
      • Re: Al Gore will unleash ManBearPig upon you! - limeyexpat 2010-03-16 09:46:33 (297 views)
        • Its not Al Gore or Eric I am worried about... - cjarvis 2010-03-16 11:13:28 (322 views)
          • Re: Its not Al Gore or Eric I am worried about... - Hitmanx 2010-03-16 20:40:55 (360 views)
          • Be careful.. no methane discharges allowed... :-) (nt) - johnhstein, 85-M6CSi, 85 745i 2010-03-16 11:50:52 (329 views)