Search results for query: HMMWV clutch fan

Thanks papakb. I have read up about the hissing from the Cadillac valves, but I thought it was strange that the hissing was being affected by the brake pedal. Makes sense now as a hydro boost connected to power steering! I've owned my hmmwv for about a month and I failed to realize there was no...

Since there is NO vacuum system in the HMMWV it is highly unlikely that you have a vacuum leak! However, the Kysor Cadillac valve that controls the fan clutch is right there in the same area and hisses all over the place until the system reaches arounf 230 degrees and it shuts off to actuate...

Don't whack the nose cone...it will break.....Add 90 psi air to the hose going to clutch....and whack body only.

yes yes yes... you guys jump all over crap.. Im not having an issue troubleshooting fan clutch or overheating or anything else. Ive memorized all the 2800 pages of TMs.. And I dont think whacking the metal clutch to un-stick it is in there (Camo :ROFLMAO:) Maybe you have access to the redneck...

The HMMWV fan works backwards from what you'd expect. The Cadillac valve holds it disengaged most of the time. Disconnecting the valve connectors causes the fan to engage. This is a fail safe mode so if anything dies the fan stays engaged all the time. Disconnect the line from the Cadillac...

I already replaced the Cadillac valve with a new one. I think the main question is whether it's engagement of the fan or not why is it engaging because of engine RPM? If the temp switch is bad then it's either on or not. If the Cadillac valve is bad then it's either on or not. Why is engine RPM...

Why isn't this post in the HMMWV forum? If your cadillac valve is kaput or the TDR or the clutch is on it's way out you'll get this issue. Where does the "air burst" appear to come from? The clutch system is hydraukicly operated. Are you referring to the sound of the fan blades make when the...

Yeah I have that same setup that Leroy is offering, however I purchased my FlowKooler water pump directly from FlowKooler and my high-volume fan directly from Derale. My new clutch is NOS GM. After I thought about it and realized that the OEM fan and clutch robs horsepower, it was a no-brainer...

Ok I have made the decision to remove my brand new Derale fan and clutch and go with an electric fan instead. I’ve watched several videos including this very informative one at https://www.holley.com/blog/post/how_to_choose_an_electric_radiator_fan/ I have concluded that I want a pull-through...

Well, almost to the point of being desperate to get this pulley off. This is the last thing keeping the HMMWV from cranking. I ended up ruining this clutch pulley, did not mean to but this thing just wont release from the shaft. Now, this is what is left on the shaft.....I tried chain vise...

So finally finished up everything today. Without pulling the tub off the chassis it's kind of hard to get to where things should be run under there, and I think in reality running hard lines would be a lot better (at least underneath) than the rubber lines, bit I did what seemed like a halfway...

Y'all are cracking me up. Seriously though, I did choose the thread title for it's possible comedic interpretation. Not up for interpretation are the lessons learned so far during this project. And I still haven't pulled the pump, although it's the next step to be completed. My top 10...

RWH has more experience with HMMWV's than I do. Listen to him, but I will still give some advice. I would drop the oil pan and look for the seized piston. Should be obvious if you have a cracked cylinder wall. Then press the piston up or cut the cranks, as per both of RWH's suggestions. Gasket...

The BEOD is supposed to be mounted to the M1097A2, which is a standard A2 heavy variant with the 4 speed transmission. I have never heard of any military HMMWV having a 6 speed transmission. So when you say electrical issues, you are talking about the HMMWV itself having issues, not the BEOD...

I'm still planning a coolant flush and a thermostat refresh, but it appears that the hot running issue in my wife's HMMWV is more a case of the temperature gauge being off by 10-15 degrees. First, I have observed that the engine seems to be running cooler in general, down to an "indicated" 215F...

I helped TheCaptain replace a water pump a few summers ago. Lesson learned: tedious or not, drain and remove the radiator stack. If you don’t you’re working with your fingertips next to sharp radiator fins and can barely reach the pump and fan bolts. You’ll need to make a fitting to pressurize...

Good morning. New guy here. Just purchased a 94 m998. Seems to be in overall good mechanical condition but I am still learning how works. I have tracked down a power steering leak to my fan clutch. Ive done quite a bit of research on this site and others and still am not clear on exactly how...

Found this animated video on You Tube that demonstrates how the fan clutch works. It explains a lot about it that's hard to understand because it works differently that most people expect because of it's fail safe operation. I removed the first video I linked to because it just wasn't accurate...

Actually I do not think I am very well qualified at this point, I have only the first impression of the HMMWV, I do have allot of experience with the Unimog, mostly the 404s, and I did own a 424 for a couple years. I used to be an "agent" for a man that imported 404s of all configurations, I...

Cadillac valve controls the fan clutch operation. Called that because part of the brand name for it is indeed cadillac. I believe properly it's called the Kysor-Cadillac solenoid, but cadillac valve is quicker and easier to say.