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Napa 81-1411 I can't remember offhand where I got that part number. Probably from the hummer knowledgebase. My Napa jobber was speechless for a moment after I gave him that part number to look up in his system. He finally spoke and said "I've never seen a part in our database without any kind...

Took apart my cadillac valve to try to get my fan working correctly again. Didn't see anything wrong w the valve internals but after bleeding all air from it and driving a few miles my fan is declutched now. Have to drive farther to see that it turns on at high temp. So so far so good. I'll...

Action: yes, that happened as a matter of course when I was fiddling w the Cadillac valve as part of all that. Didn't appear to make a difference. Sorry to not mention it. I'll try to blow out the valve. It could have picked up something when the return tubes and primary pressure tube were...

Well, here is what I figured out tonight. My fan temperature switch which is on circuit wiring number 458 is located in the coolant system crossover piping, which is normally closed, is closed when cold. So I think my fan temp switch is ok. I verified that this switch is indeed electrically...

Thanks for the extra information. I will run some electrical checks when I get home. Having a swim meet for my 7yo at the moment! Bulldogger

The fan was working fine before I replaced the steering pump and boosted the system pressure. (certainly steers like I have more pressure) Retiredwarhorses, does this mean the system failed for some reason because I upgraded the pump? I assume I have to obtain a new replacement thermostatic...

I noticed after a few driving sessions following the installation of a new steering pump on my Humvee last weekend that the fan is always clutched in. This means that the fan changes speed with the motor. It also means the engine takes a long time to get up to operating temperature. It doesn't...