Question about BMW 323i

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When my car turn on start switch...eng running. I don't turn on a/c switch but compressor pully and clutch are running together Is it ok or problems? Car is BMW e90. 323i 2010 year Thank you

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Is the heater control in the defrost position? Most cars will automatically turn the air conditioning compressor on when defrost is selected to dehumidify the air being directed on the windshield. This keeps the windshield from fogging up, and helps defog the windshield more quickly if it is already fogged up.

Posted on Dec 10, 2016

Testimonial: "Thank you for your answer Then what does the heater control in the defrost posision mean? Just turn on air flow to front( There are 3 positions-upper/front/under)"

  • 2 more comments 
  • Randy Ohler Dec 10, 2016

    When running in defrost mode it should kick on and off. Runs all the time, have the codes read.

  • Anonymous Dec 10, 2016

    Thank you for your information.
    I am sorry I don't know "the code"?
    What does the code mean?
    When the eng was running------ a/c,heater were not working

  • old marine
    old marine Dec 10, 2016

    Defrost would be the 'upper' position - blowing air on the windshield. Move the selector to 'front' and see if the a/c compressor clutch disengages.
    Codes are diagnostic trouble codes (DTCs) that are read from your computer (PCM/ECM) by a scan tool to see if the computer has detected any problems.

  • Anonymous Dec 10, 2016

    Thank you very much.".



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Probably the high pressure switch on the accumulator - try disconnecting the connector and jumping the pins to see if the clutch will engage. If that is the problem, DO NOT leave it jumped - replace the switch.
If that is not the problem, you will have to check the clutch wiring, relay and fuse for continuity back to the HVAC controls. If that is OK, the problem will probably be in your HVAC control module.

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