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Fan / Clutch Upgrade

So the history on the cooling system is early v belt models had a low volume water pump that was normal rotation. When they went to the serpentine belt system they still had a low volume water pump but it is reverse rotation. In 96 (depending on which manufacturing plant) they went to dual stats and a higher flow water pump, (all 6.5 serpentine we're reverse rotation) starting in 98 they went to spin on fan clutch. Most say to order one for a 99 to make sure you get a balanced flow pump.
 
If I remember right. They started offering “high output”water pumps in 97 but was the 4 stud water pump but it still didn’t come close to balancing the system. After that didn’t work like it should have. They come up with the 99 and 2000 balanced flow water pump.
 
ak diesel driver said:
So the history on the cooling system is early v belt models had a low volume water pump that was normal rotation. When they went to the serpentine belt system they still had a low volume water pump but it is reverse rotation. In 96 (depending on which manufacturing plant) they went to dual stats and a higher flow water pump, (all 6.5 serpentine we're reverse rotation) starting in 98 they went to spin on fan clutch. Most say to order one for a 99 to make sure you get a balanced flow pump.
Click to expand...
That is something I can understand. Now I know what needs to be done.
 
On my 99 built May+ Using EVANS I tried sealing the bypass and used two Stewart high flow drilled thermostats which equaled the same bypass flow as the bypass hose stock until the stats opened, I tried the re-stricter within the bypass with 180 deg & 195 deg stats & stayed with this configuration however; I needed a weather front over the grill during some cold climate
 
In all actuality my truck never really gets hot. Runs on the cool side. Did it that one time in stop and go traffic pulling my camper going uphill.
 
Jaryd said:
If I remember right. They started offering “high output”water pumps in 97 but was the 4 stud water pump but it still didn’t come close to balancing the system. After that didn’t work like it should have. They come up with the 99 and 2000 balanced flow water pump.
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That high output WP your referring to is the one that I was talking about starting in 96. My 96 had it. I believe the balance flow started with the spin on clutch
 
ALL v belt waterpumps are ok, no panic there.
Serpentine belt 4 bolt waterpump were 97 gpm. Then GM made the H.O. waterpump which was 127gpm (often called 130 gpm as rounded figure) and is still 4 bolt water pump. This still flows 75% driverside, 25% pass side.

Then GM corrected the problem with a balanced flow waterpump that also does 127 gpm but is identifiable by the single large nut that mounts fanclutch to pump- this is the "spin on".

If you choose to run the 4 bolt pump, add a secondary temp gauge reading the passanger side head, and know that the coolant against cylinder #8 is 10-15 degrees hotter on a silver dollar sized location due to flow issue. just be careful. 1 advantage to the H.O. 4 bolt pump is easy use of hmmwv 100% lockup clutch that is rebuildable every 100,000 miles-ish for $50 from ebay parts kit. about $130 new from dealer.

Also- NEVER buy reman waterpumps for these. I will use reman waterpumps on rigs, I don't care. But the remans FREQUENTLY put on wrong impeller size, direction, etc because there were so many options made, so avoid them on this engine.

The thing that made it easy and cheap for so many was when peninsular diesel used to sell the take off new pumps for $20, so it was the cheapest part. (boats use different water pumps), but peninsular is now closed, sorry all.
 
Twisted Steel Performance said:
@Possum I have some parts here, I'm not sure at the moment just what all is here, I will look this weekend and I may have something you can have cheap, I know I have a 9blade fan I'm not using and a good clutch, let me check this weekend, if you haven't ordered anything yet hold off till I check what I have...
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I have already ordered everything. I am one of those impatient people that have to have it now. Lol
 
Anyone know the difference in the two ? Not just 4 holes or screw on . Has anyone had the cover off to see ?
 
As Shiker said, clean the stack.
That's the coolers stacked in front of each other IN FRONT OF the radiator. Leaves, bugs, animal hair, etc. forms a mat between them blocking air flow. I remove the grille, oil cooler, trans cooler, and A/C condenser. Remove the debris with gloves! I prefer "Wally Mark" fume free oven cleaner to spray and let it soak. Don't use too much water pressure to rinse with, it can deform fins.
I was amazed at the junk that was hiding there. To prevent a replay of this, after reassembly, I made a protector in front of the grille:
2 re-purposed oven racks attached at the top of the grille and the top of the bumper, covered in front by 1/4" (more or less) hardware screen. Final (or first) layer of protection is cheap window screen as a disposable and easy to replace way of stopping the crud. I get a few odd looks, but I don't care.. It works. I need to repaint the air dam. You may also notice the added cool air inlets below the PS headlight.20170221_151622.jpg 20170221_151738.jpg 20170221_151753.jpg
 
Yeah, it's amazing how well grasshoppers, moths, butterflies and especially bees can clog up the cooling fins on an A/C condenser or radiator in no time flat!
 
Yeah, where some of you guys live that screen idea could be golden. Here it takes a year to fill up condenser to what you guys could do in a month of springtime. I am thinking with my hummer of using the screen tried down like a blanket and mine would be hidden under the hood. Probably do my sons 01 dodge easy too.
 
Screens are a restriction. Trade off for less bug clogs is a call you make...
 
And then there's the midges, flies, earwigs, june bugs, lady bugs, cicadas (BIG splats), wasps, hornets, bumble bees, katydids, praying mantises, crickets and lightning bugs I've cleaned out of the cooling fins of my stack. Bug screens are very acceptable out here on the Great Plains, much easier to take them off and clean than to take the stack apart and properly clean all the casualties out when she starts to run on the warm side.
 
Will L. said:
Yeah, where some of you guys live that screen idea could be golden. Here it takes a year to fill up condenser to what you guys could do in a month of springtime. I am thinking with my hummer of using the screen tried down like a blanket and mine would be hidden under the hood. Probably do my sons 01 dodge easy too.
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Month? Try a couple of days, or even one drive through a cloud of bees when they're swarming. I drove through a swarm of bees crossing the highway while on my motorcycle up in Minnesota back in '82. It was neither enjoyable, pretty or neat!
 
Husker6.5 said:
And then there's the midges, flies, earwigs, june bugs, lady bugs, cicadas (BIG splats), wasps, hornets, bumble bees, katydids, praying mantises, crickets and lightning bugs I've cleaned out of the cooling fins of my stack. Bug screens are very acceptable out here on the Great Plains, much easier to take them off and clean than to take the stack apart and properly clean all the casualties out when she starts to run on the warm side.
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Adding: Small furry things like cats, Coyotes, tumbleweeds, tire debris, small cars, road gravel esp in snow country, Elk...
 
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