2012 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 are listed for the 2012 Isuzu NPR, from PRESTONE, PEAK, VALVOLINE and 1 other brand. FVP MV5050GAL carries the "Popular" badge. 13 parts fit every engine; the other 1 is engine-specific.

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 5 options from VALVOLINE, PRESTONE and PEAK — 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.

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

One part is listed for the 2012 Isuzu NPR — GATES HHA147.

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

4 Cooling System Tester Adapter parts are listed for the 2012 Isuzu NPR, from 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

9 Radiator parts are listed for the 2012 Isuzu NPR, from OSC, CSF, LILAND GLOBAL and 3 other brands.

Economy: 1 part, from GPD. A representative part number is GPD 9282733.

The Standard Replacement section lists 1 option from OSC — built to original-equipment specification. OSC HD1176 is listed in this group.

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

This group includes GPD 9282733, OSC HD1176 and AGILITY 8067210 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 are listed for the 2012 Isuzu NPR, from GATES, MOTORAD, CALORSTAT and 1 other brand. MOTORAD T16R carries the "Popular" badge. 3 parts fit every engine; the other 3 are engine-specific.

The Locking Replacement section lists 3 options from CALORSTAT, GATES and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. CALORSTAT RC0212 is listed in this group.

The Standard Replacement section: 3 options from MOTORAD, SKP and GATES. MOTORAD T16R is listed in this group.

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

This group shows a single part: DORMAN 6205602.

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 are listed for the 2012 Isuzu NPR, from FOUR SEASONS, HAYDEN, NISSENS and 1 other brand.

This group includes FOUR SEASONS 36947, HAYDEN 2787 and NISSENS 86465 and the remaining parts 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

3 Temperature Sender / Sensor parts are listed for the 2012 Isuzu NPR, from STANDARD MOTOR PRODUCTS and DORMAN.

Economy: 2 parts, from DORMAN and STANDARD MOTOR PRODUCTS. A representative part number is DORMAN 926016.

The Standard Replacement section: 1 option from STANDARD MOTOR PRODUCTS. STANDARD MOTOR PRODUCTS TX89 is listed in this group.

This group includes DORMAN 926016, STANDARD MOTOR PRODUCTS TX89T and STANDARD MOTOR PRODUCTS TX89.

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 for the 2012 Isuzu NPR come from 6 brands — MOTORAD, CALORSTAT, GATES and 3 other brands. The "Popular" part is GATES 33963.

The Economy section: 3 options from AUTOTECNICA, DORMAN and SKP. AUTOTECNICA GM0718523 is listed in this group.

Heavy Duty: 5 parts, from GATES and MOTORAD. A representative part number is GATES 33963.

The Performance section lists 2 options from MOTORAD — engineered beyond original-equipment specification. MOTORAD 2523160 is listed in this group.

Standard Replacement: 9 parts, from MOTORAD and CALORSTAT. A representative part number is MOTORAD 523190.

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

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

3 Thermostat Housing / Water Outlet parts for the 2012 Isuzu NPR come from 3 brands — DORMAN, GATES and MOTORAD.

The Economy section: 1 option from DORMAN. DORMAN 9022081 is listed in this group.

Standard Replacement: 2 parts, from GATES and MOTORAD. A representative part number is GATES CO34829.

Part numbers include DORMAN 9022081, GATES CO34829 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

9 Water Pump parts for the 2012 Isuzu NPR come from 6 brands — US MOTOR WORKS, FVP, GMB and 3 other brands. The "Popular" part is US MOTOR WORKS US6009.

The Economy section: 5 options from US MOTOR WORKS, FVP and SKP. US MOTOR WORKS US6009 is listed in this group.

Standard Replacement: 4 parts, from GMB, DAYCO and GATES. A representative part number is DAYCO DP990.

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