2011 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

14 Coolant / Antifreeze parts for the 2011 Isuzu NPR come from 4 brands — PRESTONE, PEAK, VALVOLINE and 1 other brand. The "Popular" part is FVP MV5050GAL. 13 parts fit every engine; the other 1 is engine-specific.

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, VALVOLINE, PRESTONE and PEAK supply 5 parts: rated for severe service. A representative part number is VALVOLINE ZXG051.

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.

This table covers the Coolant Air Bleed Hose pipes. Read more

This group shows a single part: GATES HHA147.

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 2011 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 2011 Isuzu NPR come from 3 brands — MOTORAD, GATES and STANT. 1 part fits every engine; the other 3 are engine-specific.

This group includes GATES 31428, MOTORAD 3121 and MOTORAD 3122 and the remaining parts above.

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

11 Radiator parts for the 2011 Isuzu NPR come from 6 brands — GPD, CSF, LILAND GLOBAL and 3 other brands. The "Popular" part is CSF 3832. 1 part fits every engine; the other 10 are engine-specific.

The Economy section: 4 options from GPD. GPD 9282733 is listed in this group.

In the Standard Replacement grade, CSF, AGILITY, OSC and 1 other brand supply 5 parts: built to original-equipment specification. A representative part number is CSF 3832.

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

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 2011 Isuzu NPR come from 4 brands — GATES, MOTORAD, CALORSTAT and 1 other brand. The "Popular" part is MOTORAD T16R. 3 parts fit every engine; the other 3 are engine-specific.

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.

Listed part numbers: MOTORAD T16R, CALORSTAT RC0212 and GATES 31534, plus the other parts 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

4 Radiator Fan Clutch parts for the 2011 Isuzu NPR come from 4 brands — FOUR SEASONS, HAYDEN, NISSENS and 1 other brand.

Listed part numbers: FOUR SEASONS 36947, HAYDEN 2787 and NISSENS 86465, plus the other 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

CONTINENTAL supplies both parts for the 2011 Isuzu NPR.

Part numbers include CONTINENTAL 66009 and CONTINENTAL 66956.

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

21 Thermostat parts are listed for the 2011 Isuzu NPR, from MOTORAD, CALORSTAT, GATES and 3 other brands. GATES 33963 carries the "Popular" badge.

Economy: 3 parts, from AUTOTECNICA, DORMAN and SKP. A representative part number is AUTOTECNICA GM0718523.

The Heavy Duty section: 5 options from GATES and MOTORAD. GATES 33963 is listed in this group.

In the Performance grade, MOTORAD supplies 2 parts: engineered beyond original-equipment specification. A representative part number is MOTORAD 2523160.

The Standard Replacement section: 9 options from MOTORAD and CALORSTAT. MOTORAD 523190 is listed in this group.

2 ungrouped parts are not assigned to a grade, with the same engine-level match.

This table covers the housings and outlets the thermostat sits in. Read more

2 Thermostat Housing / Water Outlet parts are listed for the 2011 Isuzu NPR, from DORMAN and MOTORAD.

Economy: 1 part, from DORMAN. A representative part number is DORMAN 9022081.

The Standard Replacement section: 1 option from MOTORAD. MOTORAD CH5945 is listed in this group.

Part numbers include DORMAN 9022081 and MOTORAD CH5945.

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

7 Water Pump parts are listed for the 2011 Isuzu NPR, from US MOTOR WORKS, FVP, GMB and 1 other brand. US MOTOR WORKS US6009 carries the "Popular" badge.

Economy: 4 parts, from US MOTOR WORKS and FVP. A representative part number is US MOTOR WORKS US6009.

The Standard Replacement section: 3 options from GMB and DAYCO. DAYCO DP990 is listed in this group.

Part numbers include US MOTOR WORKS US6009 and US MOTOR WORKS US6009T, among others listed above.