2004 Isuzu NPR 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

15 Coolant / Antifreeze parts for the 2004 Isuzu NPR come from 4 brands — PRESTONE, PEAK, VALVOLINE and 1 other brand. The "Popular" part is FVP MV5050GAL.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 4 options from FVP, PEAK, PRESTONE and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

In the Heavy Duty grade, PRESTONE and PEAK supply 4 parts: rated for severe service. A representative part number is PEAK FXA1GAL.

In the Premium grade, PRESTONE and PEAK supply 4 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, VALVOLINE supplies 2 parts: built to original-equipment specification. A representative part number is VALVOLINE ZXEL1.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

One part is listed for the 2004 Isuzu NPR — DORMAN 6035603.

This table covers the caps on the overflow / expansion tank. 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

One part is listed for the 2004 Isuzu NPR — DORMAN 9241059.

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

4 Cooling System Tester Adapter parts for the 2004 Isuzu NPR come from 3 brands — MOTORAD, GATES and STANT.

Part numbers include GATES 31428, MOTORAD 3121 and MOTORAD 3122, among others listed above.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

2 Intercooler parts for the 2004 Isuzu NPR come from 2 brands — GPD and SPECTRA PREMIUM.

Listed part numbers: GPD 2711271 and SPECTRA PREMIUM 44010707.

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

9 Radiator parts for the 2004 Isuzu NPR come from 6 brands — GPD, OSC, LILAND GLOBAL and 3 other brands. The "Popular" part is ULTRA-POWER 20010701.

The Economy section: 3 options from GPD and ULTRA-POWER. ULTRA-POWER 20010701 is listed in this group.

Standard Replacement: 4 parts, from OSC, SPECTRA PREMIUM and UAC. A representative part number is SPECTRA PREMIUM 20010701.

2 further parts sit outside the graded sections, with the same engine-level match.

This group includes ULTRA-POWER 20010701, GPD 9243220 and GPD 9282730 and the remaining parts above.

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

6 Radiator Cap parts for the 2004 Isuzu NPR come from 4 brands — GATES, MOTORAD, CALORSTAT and 1 other brand. The "Popular" part is MOTORAD T16R.

In the Locking Replacement grade, CALORSTAT, GATES and MOTORAD supply 3 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is CALORSTAT RC0212.

Standard Replacement: 3 parts, from MOTORAD, SKP and GATES. A representative part number is MOTORAD T16R.

This group includes MOTORAD T16R, CALORSTAT RC0212 and GATES 31534 and the remaining parts above.

This table covers the Radiator Fan blades. Typical signs include chatter, streaks, or a skip at the top of the stroke. Confirm left and right lengths in the notes — they are often different. Read more

2 Radiator Fan Blade parts are listed for the 2004 Isuzu NPR, from DORMAN and GPD.

This group includes DORMAN 6205603 and GPD 2812352.

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

8 Radiator Hose parts are listed for the 2004 Isuzu NPR, from CONTINENTAL, GATES, ACDELCO and 1 other brand. CONTINENTAL 62699 carries the "Popular" badge.

This group includes CONTINENTAL 62699, GATES 23096 and ACDELCO 20456S and the remaining parts above.

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

4 Thermostat parts are listed for the 2004 Isuzu NPR, from GATES and MOTORAD.

The Heavy Duty section: 2 options from GATES. GATES 33964 is listed in this group.

The Standard Replacement section: 2 options from MOTORAD. MOTORAD 405785 is listed in this group.

Part numbers include GATES 33964, GATES 33965 and MOTORAD 405785, 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

5 Water Pump parts are listed for the 2004 Isuzu NPR, from FVP, US MOTOR WORKS, GATES and 1 other brand. GATES 42239HD carries the "Popular" badge.

Economy: 2 parts, from FVP and US MOTOR WORKS. A representative part number is FVP US8969.

In the High Volume / Pressure grade, GATES supplies 1 part: grouped under the catalog's "High Volume / Pressure" designation — the notes column spells out what sets them apart. A representative part number is GATES 42239HD.

The Standard Replacement section: 2 options from FVP and GMB. FVP 1401420 is listed in this group.

Listed part numbers: GATES 42239HD and FVP US8969, plus the other parts above.