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Thread: 2005 525i m54 a/c not cooling enough

  1. #1
    Join Date
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    2005 525i m54

    2005 525i m54 a/c not cooling enough

    Hi
    I have problem with Ac, at vents on Idle I have Minimum 70F. Outside temp around 89F. No errors in Inpa. Pressure sensor ok. Blowers ok.
    Low line at Idle 45-50 Hi line 200-225.
    When I put more rpm pressure on Hi line go down to even 150 and on Low line go up to 65-70.
    I don't know where can be problem. Compressor?

  2. #2
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  3. #3
    Join Date
    Mar 2008
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    Napa, Ca
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    1987 M6
    A quick thought on your symptoms is R134 flow issue. So maybe it's a problem with blockage at the expansion valve. I haven't checked the manual, maybe there is a regulator in the system. A faulty regulator could have the same effect.

    Jose
    1987 M6
    Livin the dream!

  4. #4
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    2001 525it
    Who serviced the ac

  5. #5
    Join Date
    Jul 2017
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    Morrisville Pa
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    My Cars
    2005 525i m54
    I bought car 1 year ago and there was problem with ac and seller add r134. This year ac stop working. Commpressor was loud but working. Yesterday I refilled system. Pump system for 1hr, no leaks, add 6oz oil and 28.5 oz r134 like on sticker. Dont help at all.
    Now I have pressure Low line 60 Hi line 160 at 80F.
    Vents 76F.
    No errors at all in Inpa.
    Pressure sensor showing good, Heater valve checked, temp sensors showing ok. Even checked for debris between radiator and condenser.
    Compressor one time pump to 225psi and start cooling but when radiator fan turn on pressure again drop to 160.
    One more. Ikha don't have Vin number only ????? In ncs expert I don't have option to choose my engine. There is only m54 but 3.0l. I have 2.5l.
    Last edited by djroofer; 07-21-2017 at 12:38 PM.

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