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Just make sure your fluid is topped of and give it a little time, it sometimes takes awhile to get all the entrained air out of the fluid. Does it change when you steer the truck?

If the cadillac valve is making noise it will change when the valve turns on the fan, the noise will not stay the same is what I am trying to say.

Before going through all the trouble make sure it is the Cadillac valve, the "noise" will change between the fan running and not, you can simply unplug the wires from the valve to activate the fan, if the noise stays the same it is not the valve.

He has a serpentine belt, I have never heard one of those slipping but I guess anything is possible after cooking in the California desert for decades!!

The entire tool kit I listed above is only $300 with shipping and there are a ton of handy tools besides the pump test kit from changing ball joints/tie rods to replacing seals and bearings and much more, comes with a rivet/rivnut tool, it even has a run flat remover,,, well worth every penny...

The "civy" pump (metric Saginaw P series) is the same the only difference is the pressure relief valve, I used a rebuilt (Cardone) one for 3 years on the Detroit before going to the remote type when re-powered with the GEP turbo. The only thing I did was use the pressure/flow tune up kit...

I am just curious how the "bad pump" charges the accumulator to begin with? pumps generally make pressure/flow or they don't. also how does the pump know when he gets to the same point in the steering every time so it knows to quit?

Curious does the steering act the same in both directions? how about the brakes. There is a special tool kit for the HMMWV that does not cost TOO much it has a test gauge setup to test the PS pump flow and pressure among many other handy tools to have...

I know we are not supposed to just tell you "go read the dang TM" but you will have a much better experience and probably spend allot less money just "swapping parts" if you would have made yourself familiar with the TMs applicable to your truck including the operators maintenance TM, while you...

Yep, was a long time before they went to the remote reservoir

I would like to try a thermal clutch, especially if I could find one that fits the OEM fan.

Detailed pics of the thermal fan setup!

The PS pump has three lines in play one HP and two returns, if both of those return lines are going to the pump then there should be a reservoir cap between the alt and lower pulley, if it had the remote type pump there would only be two connections on the pump itself so both those return lines...

Where are those two hoses going that are behind the Cadillac valve? those should be going to the reservoir. Your pinky is just about touching one in the picture