Is your HMMWV running hot at 210-230°F and losing engine power when the fan engages? Upgrade your outdated hydraulic fan setup with our advanced thermostatic cooling kit.
 
The stock HMMWV system, designed to run hot to efficiently burn multi-fuel and JP8 (jet fuel), is ideal for a military vehicle that spends most of its time in storage with little mileage. However, it’s far from ideal for longevity, causing many heat-related engine issues, particularly block cracking near the #8 cylinder.
 
Our bolt-on cooling upgrade kit includes:
High-flow fan
Severe duty clutch
CNC machined billet aluminum water pump pulley
All required hardware (nuts, bolts, and studs)
 
This upgrade allows the removal of the factory fan, factory water pump pulley, hydraulic clutch, solenoid control valve (Cadillac valve), time delay module (TDM), and associated hydraulic hoses.
 
Key benefits:
Maintains engine operating temperature between 185-190°F for increased longevity
Significantly decreases engine noise
Reduces fan cycling
Minimizes HP draw on the engine when engaged
Incredibly reliable with no hydraulic system/clutch to fail
Retains original water fording depth of 30"
Substantial weight savings prevent premature failure of water pump seals and bearings
 
Our water pump pulley is made from billet aluminum and includes a machined centering pin. Crafted from T6 heat-treated 6061, and finished with a Milspec Type III anodized coated (MIL-A-8625). This coating provides enhanced corrosion and wear resistance, improved durability, and excellent adhesion properties.
 
A weight savings of 7 lbs contributes to a longer life for the water pump, as the lighter pulley reduces stress on the pump seals and bearings, unlike the heavy factory billet steel versions which cause excessive wear.
 
Designed for 6.2 and 6.5 engines with V-belt setups, this upgrade is the perfect solution to keep your HMMWV cool and running efficiently.
 
Fitment:
Model (Serial Number Range)
M966 (000001 to 099999)
M966A1 (100000 to 163XXX)
M996 (000001 to 099999)
M996A1 (100000 to 163XXX)
M998 (000001 to 099999)
M998A1 (100000 to 163XXX)
M1026 (000001 to 099999)
M1026A1 (100000 to 163XXX)
M1035 (000001 to 099999)
M1035A1 (100000 to 163XXX)
M1038 (000001 to 099999)
M1038A1 (100000 to 163XXX)
M1043 (000001 to 099999)
M1043A1 (100000 to 163XXX)
M1044 (000001 to 099999)
M1044A1 (100000 to 163XXX)
M1045 (000001 to 099999)
M1045A1 (100000 to 163XXX)
M1046 (000001 to 099999)
M1046A1 (100000 to 163XXX)
M1097 (000001 to 099999)
M1097A1 (100000 to 163XXX)
M1121 (100000 to 163XXX)