fan clutch mystery / theory

[Ken B]

Additional information stolen from the Hayden web site:

http://www.haydenauto.com/featured%20products-fan%20clutches%20and%20fan%20blades/content.aspx

" Some Chevrolet/GMC truck models are specifically designed to engage at lower temperatures than the original equipment parts that they replace. "
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[Ken B]

It is not the number of blades as much as it is the diameter and pitch of the blades. I can not give you a positive answer but I would assume that
the OEM Heavy Duty clutch ought to still work in a GMC with that fan.

--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana