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second drive belt on front of engine

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  • second drive belt on front of engine

    what is unit that is driven by the second drive belt [lower one] on the front of the engine

  • #2
    There's an "auxillary" air pump down there? attached to the airbox afaik.

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    • #3
      air pump

      what dose it do and what happens if the belt is off

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      • #4
        hi

        this is a good question, my airpump was grumbling afew months ago, a garage disconnected it as they couldnt get a replacement before i needed the car. its been disconnected ever since. I believe it runs the aircon/air through the heater?

        Does anyone know the BMW part number for the aux air pump?

        cheers
        steve

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        • #5
          It's most likely an air pump for emissions, nothing to do with aircon or ventilateion. Itis piped to the airbox and exhaust I think so blocking it off won't cause any problems.

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          • #6
            ah good to know, thanks.

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