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  1. #1
    Join Date
    Apr 2007
    Location
    Houston, TX
    Posts
    127
    My Cars
    2002 540i/6

    E53 4.4i Air Conditioning mystery

    Here's the mystery. If I haven't driven my X5 for a couple of hours it can take three or four miles until the AC starts working. To get it to work I've started accelerating quickly three or four times under the presumption that the acceleration would "jolt" the AC into working. I've found that when I do accelerate hard two or three times that it starts to work so who knows. I thought it might be the belt or belt tensioner so I swapped them out but the problem persisted. When the AC starts working it blows cold and consistently and if I turn off the car and leave it for an hour the AC works straight away. I had the AC refrigerent checked and it's normal. Has anyone seen this problem?

  2. #2
    Join Date
    Jan 2007
    Location
    .
    Posts
    7,708
    My Cars
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    I've seen it many times. Not sure why it happens, but the only way I've fixed them here in the shop is with a new A/C compressor.
    ASE and BMW Master Certified Technician

  3. #3
    Join Date
    Apr 2007
    Location
    Houston, TX
    Posts
    127
    My Cars
    2002 540i/6
    Thanks - I appreciate the feedback.

  4. #4
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    So you had it fully service and had the pressures check?

  5. #5
    Join Date
    Apr 2004
    Location
    Oklahoma
    Posts
    5,083
    My Cars
    996, 914, X5
    I had the same problem on my 06 4.4i. serviced at the dealer, they said all was working well and topped up the refrigerant. within a few weeks it was back to the same...in the middle of summer.

    it's been two years and still haven't had time to get it fixed again. I'm thinking a new compressor is what it needs

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