After getting back from a 10 mile drive I was backing my jetski in the backyard. Upon parking (with engine running) the fan kicked in and started squealing.

I put the truck in drive and as I moved the fan kicked off and the squealing stopped. Once I parked again (with engine running) the fan would squeal.

Anyone have this happen before? Where should I grease and what type of grease should I use?

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The Truck: 1997 Black F-150 Flareside. Regular Cab ORP and Towing Package
The Mods: K&N Filter, Eurolid Hard Tonneau, Profile Windstream Side Deflectors and Lund X-Terminator Bug Deflector.
The Other Truck:
1991 Ford Explorer Sport

 

Have you checked your serpentine belt's condition? Have you ever replaced it? If it's fine, you could try some belt dressing.

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2000 F-150 XL, RC, LB, 5.4L, 4R70W, 4.10LS,
Class III tow, Payload #3, & Convenience pkgs.,
4-wheel disc/ABS, Chestnut/Parchment 40/60,
Ford bedliner w/Paintsaver & gas/wheel/spare locks,
K&N F.I.P.K. w/Outwears pre-filter, Superchip,
Dynomax ultra-flow welded 3" cat-back w/ 3" Y-pipe,
Hellwig front & rear anti-sway bars, Rancho RS 9000s,
Pirelli Scorpion Zero 275/60/16s, Mobil 1, K&N oil filter.

 

I agree with Max. Sounds like either bad belt or weak tensioner pulley.

 

ttt