Dpas1973
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Thx brother that was a better explanation than the tm manual. I have a serpentine belt and the rear of the clutch does not look like yours.OK... last call to the fan guys. Then I am blowing this thread off. LOL
Don't know what one has. All rusted up, bent busted, went swimming in the ocean... whatever. This "tap and a wack" may work to free up the clutch AND you maybe just be that unlucky dude.
To put it all together, look over my last posts to this COMMON STUCK fan fail points. Here are some pictures for those that like pictures. YRMV
Years ago with nothing to do... painted my fan hub red. YEP red. Not only does it look cool and run cooler, but easier to tell and see when working correctly.
This photo engine is off... fan is engaged as a reference. Logic is not conventional... Hydro pressure off, fan lock-up. This is where the air hose comes in.
I point to the hub ring to take the hits. See arrow. Use a long 3/8 extension if you don't mind banging on your tools that way. I don't !
Go at it at right angles to hub. Not so much as pointer angle shown. Air applied. Gota have air 150 PSI, rotate around. get at it from another direction.
View attachment 813736
This may help. Squirt your favorite "Mr. Mechanic" in a can in the air, on your helper... trying for the opening where the bent welding rod is pointed. Take a break and let it do the work. Maybe do this first. Yea first. Don't worry it will dry out. Safety first.
View attachment 813737
This photo is engine running. Fan is engaged. Air is a moving thru radiator stack. In my Red Line set up, I and Bear know that it is working.
To test system, any component disconnected will produce FAN LOCK UP. The valve solenoid, the valve mechanical action, the TDM, crossover temp switch (or an internal wiring break ) or real low PS pump pressure (along with everything else failing)
BUT a failed / stuck clutch, there's no choice but to start there with air hose at the ready. MY logic IMO. Again YRMV.
The last word in the design is FAN clutch FAIL. If system can't cycle... Likely cooler than normal operating temps all around. Stuck means stuck. Rimes with F and F problem. Doesn't hurt anything, (overall performance) just not working as design and more money at the pump and freeze you buns off in coming months.
View attachment 813739
OK... beat that horse to death. NOW see the thin red line. Using hub ring as a gun sight. Clutch/ fan assembly under hydro pressure move towards engine, hiding red line. Fan is free wheeling (more or less) engine HP picks up a bit, temperature stabilizes towards the lower temps. Give it a minute or two, (lots of hysteresis) engine temp on the rise, thermostatic switch in crossover OPENS and BANG on comes the fan, hot air is blow thru the cab.
View attachment 813740
This is not a sure thing in all cases. With no history, maintenance records, abuse and any and all thing that can go wrong Humv, is just another chapter for the hobby. Worked for me and others. Saved a buck and smell like WD-40.
Not a fan any more, CAMO
Free advice is free. Storytime, send likes. No bears or unicorns were hurt in my fan fix.
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