355 - Ac expansion valve | FerrariChat

355 Ac expansion valve

Discussion in '348/355' started by Klas, May 3, 2019.

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  1. Klas

    Klas Formula Junior

    Mar 17, 2014
    364
    Gothenburg, Sweden
    Full Name:
    Klas Nilsson
    F355 M5:2. Anyone having experience of a defect expansion valve in the AC system and know if it is easy to exchange? Reason for asking is that the AC system seems to work with a to low resistace giving the effect that the idle speed is too high when AC is on.
     
  2. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    9,721
    A while back, my F355 needed a new expansion valve every year.
    After having the A/C pump rebuilt, It has not needed a new Expansion valve in 8 years.
     
  3. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,217
    CT
    Full Name:
    John Kreskovsky
    Often the metering orifice becomes clogged in which case it can be cleaned. But you need to find out why it clogged. Residue from rotting hoses, compressor seal,.... etc.
     

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