I checked and it looks like the WJ has a regular viscous clutch fan. At least the '00 V8 model I looked at did.
It'd be good to replace it with an electric one controlled by a thermostat/switch.
I lost my turkey baster so I used a gatorade bottle, some fishtank airhose, and a vacuum pump (like a mityvac).
Reamed 2 holes in the cap with a screwdriver, put the hose thru (doesn't need to go in far, vacuum....), and sealed with RTV.
The PSF in pops' (80k mile) WJ looked like the oil change monkeys had been adding ATF.
Smelt a bit like burnt D/M3 and was dark red/brown. Holding it up to the light you couldn't see thru a small gatorade bottle full of it.
I've drained and refilled the reservoir twice now, the fluid still looks dark, and I'm using (clear) Synpower.
I'm thinking of getting a male-to-male hose fitting that fits the PS return line and flushing the entire system.
FWIW, the tranny will probably get Redline C+ ATF.
www.redlineoil.com/products_gearlubricants.asp?pvID=78&prodID=59&subcatID=19