Thanks austent and charlies84380se - I found the connector to the fan and have disconnected it for now. Its cool enough here that I don't think it would kick on anyway. Too bad it's not easier to get some lubricant on the shaft...

charlies84380se - where did you find that aftermarket fan?

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'87 BMW 325 convertible (162k + miles)
'87 300E, 144k + miles (sold)
'93 Chevy Blazer (full size), 207K + miles
'89 Sea Ray 390EC, 2 x 454's, 1550 hours...
'85 AMF Sunfish

Olde Towne Portsmouth, VA