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Thread: Air Blower Fan Numbers (Degrees)

  1. 03-20-2025, 08:25 AM #1
    SylvainC
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    Air Blower Fan Numbers (Degrees)

    May I kindly know what the numbers (degrees) on the rear of the fresh air blower fan (squirrel) are for and how they work.
    Thank you in advance
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  2. 03-21-2025, 03:38 AM #2
    SylvainC
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    Hello, my air blower fan assembly was removed from a 1970 911. I believe it to be original. I replaced the air blower/motor assembly with a Gen Porsche (OEM) assembly. I believe that this replacement assembly part # 911.571.320.32 is said to be usable for 65-89. Interesting to note that the new OEM replacement assembly also has similar numbers/degrees on the rear of the squirrel/hamster base (not clear from my picture due to the reflection but they are there), while from my research URO replacement assemblies have no such numbers/degrees on the base. The OEM replacement is presented as being sold balanced. The balancing is achieved with the movable wire clips attached to the fan blades. I am taking a wild guess that the numbers/degrees perhaps serve as a compass to assist one in the unpleasant task of balancing if required, example if one replaces only the motor, which can be done. I do not believe the numbers to be related to output. Does this make sense?

    Thank you in advance for any further commentary on this subject.
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  3. 03-21-2025, 04:40 AM #3
    edmayo
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    I'd agree with the balancing theory.
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  4. 03-21-2025, 06:03 AM #4
    SylvainC
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    Thank you Mr. Mayo.
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