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Thread: A/c light won't come back on after shutoff and restart.

  1. #1
    Join Date
    Jul 2005
    Posts
    16

    Default A/c light won't come back on after shutoff and restart.

    My air conditioning system appears to work fine. On initial start up, all lights come on, fan blows correctly on each speed, compressor cuts on, etc.

    But once the fan is cut off or iginition turned off, the a/c indicator light and compressor won't come back on immediately.

    After the ignition has been shut off for at least 15 mins., the a/c system turns back on normally.

    Fan blows on all settings as it should regardless of the a/c light being on or off.

    Is this a microfilter issue, resistor issue or what?

    Mossyoaks
    95 525iT 175K BostonGreen, roof rails, OEM tow pkg.
    95 525iT 125K AlpineIII, Tstars, roof rails
    952

  2. #2
    Join Date
    Jul 2005
    Posts
    16

    Default So no one has every had this problem?

    Bentley's is pretty vaque on this one.
    Any thoughts would be very welcomed.

    Chip

  3. #3
    Join Date
    Dec 2006
    Location
    Montreal
    Posts
    2,499

    Default

    what is the duty cycle on our compressors?

  4. #4
    Join Date
    Feb 2007
    Location
    GreenHills East-Philippines
    Posts
    1,063

    Default

    Quote Originally Posted by mossyoaks
    Bentley's is pretty vaque on this one.
    Any thoughts would be very welcomed.

    Chip
    I have the exact same problem! but mine the light is on but does that compressor cut...had it for a year and i changed almost everything...compressor, evaporator, e.valve, r.drier, sword , AC brain or the blackbox , AC temp thermostat sensor still the same...now i just live with it... if ever you found your solution let me know..and i tried asking around no luck

    HID 5000k low 3000k fogs
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  5. #5

    Default

    Quote Originally Posted by mossyoaks
    My air conditioning system appears to work fine. On initial start up, all lights come on, fan blows correctly on each speed, compressor cuts on, etc.

    But once the fan is cut off or iginition turned off, the a/c indicator light and compressor won't come back on immediately.

    After the ignition has been shut off for at least 15 mins., the a/c system turns back on normally.

    Fan blows on all settings as it should regardless of the a/c light being on or off.

    Is this a microfilter issue, resistor issue or what?

    Mossyoaks
    95 525iT 175K BostonGreen, roof rails, OEM tow pkg.
    95 525iT 125K AlpineIII, Tstars, roof rails
    952
    Mine started to do the same thing about a week ago.1st I smell musty air,then I realize it's not blowing cold air anymore. I try to shut it on or off but no luck.
    Then I hear a flap open(or close) and I have cold air again.
    It just happens when it wants to so I'm looking for a cure as well.
    Fred/Houston

  6. #6
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    What is your refrigerant pressure when running?

  7. #7
    Join Date
    Oct 2006
    Location
    Reading, UK
    Posts
    1,853

    Default

    Quote Originally Posted by Tiger
    What is your refrigerant pressure when running?
    I was going to say...

    Mine used to do something similar to this, and it eventually transpired the A/C gas pressure was approaching minimum tolerance...

    Flip on the A/C and the low pressure side would drop out, causing strange behaviour in the controller... AC wouldnt restart after a shut-off.

    Dont these systems have high pressure switches as well, to tell the controller that the system is overgassed?

  8. #8
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    Yeah, it is called Hi/Lo switch... too low pressure, compressor off... too high, compressor off too.

  9. #9
    Join Date
    Jul 2005
    Posts
    16

    Default So where do we find the Hi/Lo switch?

    I haven't had the system pressure checked. Obviously, this is a common issue with our e34s!

    I'll follow up later on how it all comes out.

    Thanks!
    Chip


    Quote Originally Posted by Tiger
    Yeah, it is called Hi/Lo switch... too low pressure, compressor off... too high, compressor off too.

  10. #10
    Join Date
    Jul 2005
    Posts
    16

    Default Got the switch, now where does it go?

    I can't seem to locate where this hi/lo switch goes in Bentley's.

    Anybody know?

    Quote Originally Posted by mossyoaks
    I haven't had the system pressure checked. Obviously, this is a common issue with our e34s!

    I'll follow up later on how it all comes out.

    Thanks!
    Chip

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