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I can't swear what was in there before but I have added some power steering fluid to it. Whatever I can gravity drain out I'll replace with ATF.

I'll drain out as much as I can when I put the new fan clutch on the truck.... since I've replaced every other related part. Hopefully, it's not so stuck I can't get the bolt holes to line up... That would suck after taking the three cooling stacks off.

Okie Dokie......

Are we saying that we don't use power steering fluid in the power steering reservoir, but use ATF fluid....or is power steering fluid the same as ATF?

OK another question.... Is there suppose to be power steering fluid in the hose that goes from the Cadillac valve to the fan clutch??? Just checking.

125 psi and repeated "tapping" with a hammer.... Nothing...

I'm in the same boat... Replaced all the ancillary parts. Fan still stuck. Sprayed it and been hitting the metal ring. If it doesn't brake loose I guess it cant be removed because I doubt the holes are lined up to remove the bolts......

Put in the Cadillac valve, Time Delay Module and Thermo Switch.... Still runs all the time... Going to use Break Free and a hammer to "tap" on the metal fan collar...maybe it will free up.

Yeah, the TDM can also be bad..... I have a "bad" habit of replacing moderately priced parts hoping it fixes the problem.... In the end it will probably be a stuck clutch on the fan hub.... That will be my last resort.

One post I read included repeated shots of PB Blaster and tapping on the metal clutch hub.... It finally unstuck itself....

That's where I am now.... New Cadillac valve, TDM and temperature switch..... fan stays engaged.... Obviously the fan clutch is stuck....

Going to replace the Cadillac valve on my M998. Looks pretty straightforward. I assume I'll lose power steering fluid. After it's in I'll add fluid and turn the wheels back and forth to get a correct level. Does this process fill the Cadillac valve so it operates ok? Thanks.