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M20 AC conversion to R134a - Is new Aux fan necessary?

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    M20 AC conversion to R134a - Is new Aux fan necessary?

    I'm planning out my AC conversion (90 325is) and it looks like I have to do the Sanden compressor, new parallel flow condenser, evap switch, dryer, new barrier lines, and o-rings. But do I really need a new electric fan? I don't see why people are replacing that in the conversions. Are they more efficient? Greater CFM? I'm in AZ so looking for the best cooling possible :)
    '90 325is

    #2
    I replaced my fan to basically complete the retrofit. I replaced / upgraded everything else and the fans are not that expensive. I also wired mine to come on high all the time with the AC (had to up-size the fuse). The newer fans are lighter and I believe higher CFM.
    2004 525i Manual - 1985 325E Coupe Manual

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      #3
      I had a '90 325i convertible when I converted mine. I kept everything original except for the dryer and all seals. It ran fine for several years until I swapped the engine. Had no leaks either. At idle it didn't work that well because the compressor wasn't designed for R134a but when the engine was above idle it blew nice and cold.

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        #4
        SOP is to run the fan on high which does generate a fair amount of noise at idle. As has been said, a replacement fan is not very costly and will give you greater airflow with less volume. Not mandatory but not a bad idea WYAIT
        Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

        https://www.r3vlimited.com/board/sho...86#post4944786
        Alice the Time Capsule
        http://www.r3vlimited.com/board/showthread.php?t=360504
        87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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          #5
          what are specs on the stock Aux elec fan vs a spal ?
          89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

          new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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