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Discussion Starter #1 (Edited)
I will try and condense one of the most commonly asked questions about cooling system upgrades into a thread with the correct part #'s currently available.

96 1/2 - 98 130GPM 4 bolt waterpump AC Delco :# 252717,GM # 88926231
2000 spin on clutch 130GPM waterpump AC Delco:# 252776,GM #88926290

Single thermostat:AC Delco:# 13191,12559338
Dual thermostat: AC Delco:# 131103,12559336

Fan 20" steel:AC Delco:# 1580730,15992650
Dmax fan:AC Delco:# 1580690, 15010202, 15228374, 1580920

My preference for the 4 bolt fan clutch is the special calibration clutch from Kennedy Diesel:http://www.kennedydiesel.com/categoryresults3.cfm?Category=1&SubCategory=65&SubCategory2=10

4 bolt fan clutch AC Delco:# 154674,15022302 (stock engagement)
Hayden severe duty:# 2839 (stock engagement)

Spin on fan clutch AC Delco:# 154691,15029405 (stock engagement)
Haydon Severe Duty spin on Fan clutch: #2840 (stock engagement)

Rad cap AC Delco:# RC81,25661994 (without turning ears)
Rad cap AC Delco:# RC27,10409635, 25060216, RC36B (with turning ears)

Radiator AC Delco:# 21380, 89018624 (auto trans)
Radiator Delphi:# RA1216 (auto trans)
Radiator AC Delco:# 21027,52477775, 89018623 (manual trans)

Water crossover bleed screw AC Delco:#10070107

Anything I may have left out please feel free to add or correct.
 

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Added into the FAQ's under Engine Cooling
:thumb:
 
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I'm finding some other numbers for water pumps that might be helpful.

The AC Delco #251-603 and GM numbers 12456231, 19168609, and 88894035 are suppose to have a more balanced flow between the left and right heads.
 

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So for a 98 with dual stats, what's the best combination of parts, IE fan, clutch and waterpump?
 

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I've gone buggy reading thru all the threads, different fan clutchs, fan's-2 Dmax choices, lol.

He tows 12K and just mentioned this trip its overheating, the fan clutch is original and has 200,000 km's on it. I have to reseal the timing cover so might as well put the 2000 waterpump in, do the bypass mod, now have to replace the fan clutch-2886 and 2840 are options and do the fan if needed.
 

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Discussion Starter #8 (Edited)
I would stick with the 4 bolt waterpump and Kennedy clutch myself-even the spin on clutches are too late engaging IMHO.

You should already have the good steel fan.

Cleaning the cooling stack is real important and with 200k on the clock the fan clutch is almost certainly toast.
 

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I would stick with the 4 bolt waterpump and Kennedy clutch myself-even the spin on clutches are too late engaging IMHO.

You should already have the good steel fan.

Cleaning the cooling stack is real important and with 200k on the clock the fan clutch is almost certainly toast.

I'll be doing the stack, did it a few years ago.

The Hayden 2886 is supposed to come on at 170, 30 deg cooler according to their specs. Couldn't find anything for the 4 bolt unit.
 

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Discussion Starter #12 (Edited)
The order has been made AFAIK,waiting on the production run and delivery.

The key to remember with engagement temp is that it is not engine temp but clutch coil temp after being heated by the air that has passed through the hot rad.
Engagement temp needs to be a lot lower than engine temp to be effective.
 

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The order has been made AFAIK,waiting on the production run and delivery.

The key to remember with engagement temp is that it is not engine temp but clutch coil temp after being heated by the air that has passed through the hot rad.
Engagement temp needs to be a lot lower than engine temp to be effective.

Thanks for the info and correct, rad temp is lower than coolant temp.
 

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I have a 1996 K3500 DRW 4 x 4 with 71,000miles. The coolant system is stock. And of course I am seeing temps that are way to high while towing (215-220). Empty and light loads are seeing only 175-180. This is a single thermostat truck. With all being stock, could you guys list an upgrade list that would best for me? I would really appreciated. Like another reader posted, I too have read all the threads and sticky's but am rather over whelmed with all the part numbers and variations. Help please! I would highly grateful!
 

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Discussion Starter #18
I have a 1996 K3500 DRW 4 x 4 with 71,000miles. The coolant system is stock. And of course I am seeing temps that are way to high while towing (215-220). Empty and light loads are seeing only 175-180. This is a single thermostat truck. With all being stock, could you guys list an upgrade list that would best for me? I would really appreciated. Like another reader posted, I too have read all the threads and sticky's but am rather over whelmed with all the part numbers and variations. Help please! I would highly grateful!
I would just use the 96 1/2- parts with the Kennedy clutch and steel fan listed in the first post of this thread myself,some say stick with the single T-stat?
 

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Thank you Racer55. Just so I understand, if it were you, you would replace the single thermostat for the dual? As well as the higher volume water pump, and the different fan, correct?
Thanks again, Ed.
 

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The recommended upgrades are:

water pump for 1998 model year (because it is a bolt on for the fan clutch) AC Delco :# 252717

improved fan (I used a duramax fan, bolts right up to the Hayden 2839 fan clutch) AC Delco:# 1580690. Note: you will have to trim the radiator shroud to use the Duramax fan. It is 1/2" wider in diameter than the stock fan. I used an orbital sander with 80 grit paper to trim mine.

HD fan clutch for 1998 model year (bolts on the water pump) Hayden 2839

Keep the single stat coolant crossover, IMHO.

You can get parts prices from Rockauto.com.

Probably should replace the radiator hoses and flush the cooling system. Also clean all the junk out between the radiator and the AC Condenser. Get a couple of cans of scrubbin bubbles and spray it on the radiator and AC Conderser. Let it soak in then flush the dirt out with water.
 
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