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Thread: Electric fan....Is it on?

  1. #1
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    Electric fan....Is it on?

    I think my electric fan is going on but how can I be sure?

  2. #2
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    Open the hood and turn on the AC. It should come on.

  3. #3
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    Quote Originally Posted by B328iC View Post
    Open the hood and turn on the AC. It should come on.
    That is exactly what I did. I think it came on but I'm still not sure. Is there a way to know visually?

  4. #4
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    I drove with AC for around 30 minutes today and temp gauge never budged from the middle area so I assume it is going on as it is supposed to do.

  5. #5
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    The Z4 has the same type of fan as the E46. Three wires going to it. Positive power, negative power and control. The control is a PWM signal from the DME. The easy way to test it is to get a scanner with BMW software or INPA. In INPA you can "activate" the fan at various speeds. Typical test speed are 25%, 50%, 75% and 100%. This covers the the failure modes of the common problems with the fan controller.
    2000 2.0L Z3 Roadster,
    2000 3.0L Z3 Roadster,
    2000 323i E46

    There is only one thing more pleasurable than working on a Z3, that's driving it top down on a fine day.

  6. #6
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    Quote Originally Posted by B328iC View Post
    Open the hood and turn on the AC. It should come on.
    The fan is PWM controlled and the fan will not be on every time the A/C is on. This method should never be used for diagnosing a fan on these engines

    Go into INPA and trigger the fan manually - its in german on mine, e-lufhting or something

  7. #7
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    Quote Originally Posted by BimmerBreaker View Post
    The fan is PWM controlled and the fan will not be on every time the A/C is on. This method should never be used for diagnosing a fan on these engines

    Go into INPA and trigger the fan manually - its in german on mine, e-lufhting or something
    Thank you.

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