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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...

Like that new shifter Fllaw. I took apart my cadillac valve to try to get my fan working correctly again. Didn't see anything wrong w the valve but after bleeding all air from it and driving a few miles my fan is declutching now. Have to drive farther to see that it turns on at high temp. So...

Amen brother. How they manage to put a (fun and capable) platform together that uses SAE and metric on the same part/component still confuses me Bulldogger

It does have a fair amount of rust, probably salty roads. It seems to be in decent condition overall. If you don't mind reconditioning the hubs and fighting some rust here and there, it can be a good truck. The rear cover is nice, though plenty of dirt found its way in the front of the...

Thanks for the details gents. Looks like I will keep an eye on it and steel myself to replacing the head gaskets in the Spring (if she makes it that long!). Bulldogger

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...

I have never bought anything with a credit card from government planet, but what many people don't know about buying something with a credit card is that whoever is accepting your payment has to pay between one and 1/2 to 4% to the credit card company . This really adds up , and it is what a...

If it is the water pump, you should see weeping or you will be able to wiggle the fan assembly on the shaft of the pump. It would be rare but it sounds like your fan might be coming loose from its mounts on the clutch. But again it should wiggle when the motor is off. If you don't have any...

I have also had the bad alternator/solenoid problem. In my case it's been either a bad starter , or a bad solenoid , but never both. If you have a spare solenoid (which is much cheaper than a starter) I'd try that. Bulldogger

Dilvoy is correct. That you can't feel the allen screw head means the bolt head is out of sync with the opening, which is not unusual at all. You need to turn the fan independent of the housing behind it. You can try yanking, since the blades are broken anyway! The TM recommends you put air...

Good point. We'll see. I'll watch it for a while and try to get a feel for how bad it is. Might have always been there since I woke her up from her slumber. BDGR

My understanding is that upgrade from 6.2L to 6.5 (turbo or normally aspirated) also involves a different control box and a few other electronic measures. But if I was being gifted one, I'd find a way to use it too! Bulldogger

Latest addition/improvement: LED headlights! After having one headlamp burn out from letting the hood drop too hard, I decided to look at LED headlights again. Last time, just earlier this year, they were still a bit pricey for my taste. I see that the price is steadily coming down, be it...

dilvoy, interesting about the bolts. I'd never heard of such a thing. I have seen head bolts get annealed, slightly, from heat and lose their ability to hold a good torque, but that was on an old Harley. Is there a risk tightening the GM bolts in place? I realize it's unlikely to stop the...

Thank you for the replies gentleman. I don't have the luxury of good working conditions to remove and replace heads now that the cold-weather has arrived. Are there no effective temporary fixes, or can I just leave it to weep? Bulldogger