2000 Hummer H1 Cooling System Parts

This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator. Read more

20 Coolant / Antifreeze parts are listed for the 2000 Hummer H1, from VALVOLINE, PRESTONE, PEAK and 2 other brands. FVP MV5050GAL carries the "Popular" badge.

The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.

In the Economy grade, FVP, PEAK, PRESTONE and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Heavy Duty section lists 3 options from VALVOLINE and PRESTONE — rated for severe service. VALVOLINE ZXG051 is listed in this group.

The Premium section lists 4 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 8 options from VALVOLINE, AISIN and PEAK — built to original-equipment specification. VALVOLINE ZXEL1 is listed in this group.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

6 Coolant Hose / Pipe parts are listed for the 2000 Hummer H1, from ACDELCO, GATES, CONTINENTAL and 1 other brand. ACDELCO 20290S carries the "Popular" badge.

Listed part numbers: ACDELCO 20290S, GATES 22210 and ACDELCO 24234L, plus the other parts above.

This table covers the adapters used to pressure-test this cooling system. Read more

3 Cooling System Tester Adapter parts are listed for the 2000 Hummer H1, from ACDELCO, GATES and MOTORAD.

Part numbers include ACDELCO 12A01, GATES 31413 and MOTORAD 3003.

This table covers the radiators that dump engine heat to airflow through the core. Typical signs include overheating in traffic, a wet core, or coolant that disappears with no puddle. Replace the cap if it cannot hold the rated pressure, and bleed the system after the swap. Read more

2 Radiator parts are listed for the 2000 Hummer H1, from AGILITY and SPECTRA PREMIUM.

Listed part numbers: AGILITY 8012370 and SPECTRA PREMIUM CU2370.

This table covers the caps that hold system pressure at the radiator or reservoir neck. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

5 Radiator Cap parts are listed for the 2000 Hummer H1, from GATES, MOTORAD and SKP. MOTORAD T16 carries the "Popular" badge.

The Locking Replacement section lists 2 options from GATES and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. GATES 31518 is listed in this group.

The Standard Replacement section: 3 options from MOTORAD, GATES and SKP. MOTORAD T16 is listed in this group.

Part numbers include MOTORAD T16, GATES 31518 and MOTORAD ST16, among others listed above.

This table covers the Radiator Fan clutches. Typical signs include slip at highway speed, chatter on takeoff, or a pedal that stays low. Resurface or replace the flywheel with the clutch — a heat-checked flywheel wastes the new disc. Read more

2 Radiator Fan Clutch parts are listed for the 2000 Hummer H1, from FVP and US MOTOR WORKS.

This group includes FVP 22618 and the remaining parts above.

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

4 Radiator Hose parts for the 2000 Hummer H1 come from 3 brands — GATES, ACDELCO and CONTINENTAL.

Part numbers include ACDELCO 26371X, CONTINENTAL 66377 and GATES 20685, among others listed above.

This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender. Read more

13 Temperature Sender / Sensor parts are listed for the 2000 Hummer H1, from WALKER PRODUCTS, NTK, WELLS and 5 other brands. NTK EF0008 carries the "Popular" badge.

Economy: 4 parts, from NTK, GPD, ULTRA-POWER and 1 other brand. A representative part number is NTK EF0008.

In the Full Service Kit grade, WALKER PRODUCTS supplies 2 parts: grouped under the catalog's "Full Service Kit" designation — the notes column spells out what sets them apart. A representative part number is WALKER PRODUCTS 21191012.

The Standard Replacement section: 7 options from WELLS, WALKER PRODUCTS, NTK and 2 other brands. NTK EF0074 is listed in this group.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

3 Thermostat parts for the 2000 Hummer H1 come from 2 brands — MOTORAD and GATES.

This group includes GATES 33922, MOTORAD 423195 and MOTORAD 423180.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

7 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2000 Hummer H1, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ. FEL-PRO 35710 carries the "Popular" badge.

Part numbers include FEL-PRO 35710, MAHLE / CLEVITE C31273 and FEL-PRO 35001, among others listed above.

This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off. Read more

6 Water Pump parts for the 2000 Hummer H1 come from 6 brands — FVP, US MOTOR WORKS, ACDELCO and 3 other brands. The "Popular" part is ACDELCO 252776.

The Economy section: 2 options from FVP and US MOTOR WORKS. FVP US5086 is listed in this group.

Standard Replacement: 4 parts, from ACDELCO, GATES, DAYCO and 1 other brand. A representative part number is ACDELCO 252776.

Listed part numbers: ACDELCO 252776 and FVP US5086, plus the other parts above.

This table covers the Water Pump & Fan Clutch assemblies. Read more

This group shows a single part: US MOTOR WORKS MCK1043.

This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

6 Water Pump Gasket parts are listed for the 2000 Hummer H1, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ. FEL-PRO ES72674 carries the "Popular" badge.

This group includes FEL-PRO ES72674, MAHLE / CLEVITE K31317 and FEL-PRO 36180 and the remaining parts above.