2005 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 2005 Isuzu NPR, from PRESTONE, PEAK, VALVOLINE and 1 other brand. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2005 NPR.

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 PRESTONE and PEAK — rated for severe service. PEAK FXA1GAL 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 2 options from VALVOLINE — built to original-equipment specification. VALVOLINE ZXEL1 is listed in this group.

This table covers the seals at the Coolant Hose / Pipe. 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

This group shows a single part: DORMAN 56390.

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

This group shows a single part: 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

This group shows a single part: DORMAN 9241059.

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

4 Cooling System Tester Adapter parts are listed for the 2005 Isuzu NPR, from MOTORAD, GATES and STANT. All of them fit every engine offered in the 2005 NPR.

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

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

3 Intercooler parts are listed for the 2005 Isuzu NPR, from CSF, GPD and SPECTRA PREMIUM.

This group includes CSF 6050, 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

12 Radiator parts are listed for the 2005 Isuzu NPR, from GPD, CSF, OSC and 3 other brands. CSF 3209 carries the "Popular" badge. 1 part fits every engine; the other 11 are engine-specific.

Economy: 4 parts, from GPD and ULTRA-POWER. A representative part number is GPD 9243219.

The Heavy Duty (All Metal Construction) section lists 1 option from CSF — rated for severe service. CSF 3219 is listed in this group.

The Standard Replacement section: 5 options from CSF, OSC and UAC. CSF 3209 is listed in this group.

2 ungrouped parts are not assigned to a grade, 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

7 Radiator Cap parts are listed for the 2005 Isuzu NPR, from GATES, MOTORAD, CALORSTAT and 2 other brands. MOTORAD T16R carries the "Popular" badge. All of them fit every engine offered in the 2005 NPR.

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: 4 options from MOTORAD, SKP, CSF and 1 other brand. MOTORAD T16R is listed in this group.

Part numbers include MOTORAD T16R, CALORSTAT RC0212 and GATES 31534, 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

4 Radiator Fan Clutch parts are listed for the 2005 Isuzu NPR, from 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

13 Radiator Hose parts for the 2005 Isuzu NPR come from 4 brands — CONTINENTAL, GATES, DAYCO and 1 other brand. The "Popular" part is CONTINENTAL 62699.

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 2005 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.

Part numbers include 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

11 Thermostat parts for the 2005 Isuzu NPR come from 4 brands — MOTORAD, GATES, DORMAN and 1 other brand. The "Popular" part is GATES 33963.

The Economy section: 2 options from DORMAN and SKP. DORMAN 9022836 is listed in this group.

Heavy Duty: 3 parts, from GATES. A representative part number is GATES 33963.

Standard Replacement: 6 parts, from MOTORAD. A representative part number is MOTORAD 456187.

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

4 Thermostat Housing / Water Outlet parts for the 2005 Isuzu NPR come from 4 brands — AUTOTECNICA, DORMAN, GATES and 1 other brand.

The Economy section: 2 options from AUTOTECNICA and DORMAN. AUTOTECNICA GM0718508 is listed in this group.

Standard Replacement: 2 parts, from GATES and MOTORAD. A representative part number is GATES CO34923.

Part numbers include AUTOTECNICA GM0718508, DORMAN 902836 and GATES CO34923, 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

14 Water Pump parts for the 2005 Isuzu NPR come from 7 brands — FVP, GMB, SKP and 4 other brands. The "Popular" part is SKP SK1307340.

The Economy section: 6 options from SKP, US MOTOR WORKS and FVP. SKP SK1307340 is listed in this group.

The High Volume / Pressure section lists 1 option from GATES — grouped under the catalog's "High Volume / Pressure" designation — the notes column spells out what sets them apart. GATES 42227HD is listed in this group.

Standard Replacement: 7 parts, from GMB, AISIN, DAYCO and 2 other brands. A representative part number is AISIN WPG027.