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First you must remove the four bolts on the front side of the pulley. (You possibly have gotten this far already).

On the back side of the fan is a large nut tight up against the pulley. It is often frozen on there, either requiring a special GM tool, or some other means to hold the pulley.

I used a bar of steel (actually a metal ruler) and drilled a hole (about 1/4") in it near the edge, using it as a lever by holding it on with a pulley bolt.

Once the nut is broken loose, it's pretty easy.

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Q: How do you remove fan clutch on 1997 blazer 4.3?
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