not extactly, getting it really cold will make it lock up. While your truck is cold turn the fan by hand. There is resistance. Same deal when river crossing. I've heard some horor stories of fan blades braking and making a mess of belts and such.

Josh


1986 Toyota 4x4 22wEBer
Ported EB Offroad H/O Head "Josh Cam"
Ported Intake & Weber38mm Carb
LCE Header & 2.25in Exhaust
RB 1" BL, RS5000, SAW Tbars

2011 FJ Cruiser - SOLD