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Hummer Knowledge Base

The Hummer Knowledge Base

Checking Fan Clutch:

  1. Check for excessive bearing play. Using fingers only, press tip of fan blade toward and away from engine. Tip of blade total movement should not exceed 0.20 in. (5.1 mm). If movement is more, replace fan drive.

  2. With engine off and ambient temperature of 50F (10C) or higher, fan should turn evenly with noticeable drag. If fan turns hard, very easily, or with uneven resistance, replace fan drive.


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