Question about BMW 528

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My 1997 BMW 528i Aircondition shuts down whenever the out side temp is very hot.At nights and when it rains during the days the A/C works fine,what could be the problem.

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  • junioro Jun 04, 2010

    Absolutily,I will start working on these solutions to get my BIMMA working in tip top shape again.
    Thank you very much dj_relly999.
    junioro.

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Hi! If the airconditioning system doesnt stand the hot temp then the problem will be on the expansion valve. When the expansion valve is faulty it fails to give cold air specially on hot weather but it runs fine on normal temp. Once replaced you'll be good. Hope this helps and have a good one!

Posted on Jun 02, 2010

  • 2 more comments 
  • junioro Jun 03, 2010

    My 1997 BMW 528i Aircondition.

    It might be the expansion valve also. But with the fan speed set high, why would the fan speed drop down to the lowest setting on its own,and you can feel the air coming out the vents very low and very cold.

    junioro

  • dj_relly999
    dj_relly999 Jun 03, 2010

    Thanks for the clarification. If thats the case then the evaporator needs cleaning. It may be covered with dust and dirt causing poor performance. It can resolve the problem.

  • junioro Jun 03, 2010

    If the evaporator is dirty causing poor porformance wouldent this prevent the A/C from working normal when the ambiant temp is cool... When its cool outside, the A/C works fine and You can set the fan speed any place along the range and the air flow is good. But as it gets Hot outside,no matter where you have the fan speed set at ,it drop off to the lowest the air is still col, and you cannot manually changeit.

    junioro.

  • dj_relly999
    dj_relly999 Jun 03, 2010

    Ok, I really do suspect the expansion valve on this plus cleaning will surely help. When its hot, I do believe that the blower gets weak and one cause can be the blower motor for it is forced too much. You may need to replace the blower motor too.

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