2015 International Workstar 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 2015 International Workstar, from PRESTONE, VALVOLINE and PEAK. PRESTONE AF3100 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, PRESTONE and VALVOLINE supply 2 parts: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Heavy Duty section lists 9 options from VALVOLINE, PRESTONE and PEAK — rated for severe service. VALVOLINE ZXG051 is listed in this group.

The Premium section lists 2 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

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

This table covers the Coolant filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for. Read more

One part is listed for the 2015 International Workstar — WIX 24070.

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

3 Coolant Reservoir parts for the 2015 International Workstar come from 2 brands — GPD and DORMAN.

Part numbers include DORMAN 6035132, GPD 2421019 and GPD 2421035.

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

3 Coolant Reservoir Cap parts for the 2015 International Workstar come from 3 brands — DORMAN, GATES and MOTORAD.

Part numbers include DORMAN 9025102, GATES 31405 and MOTORAD T39.

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

GATES supplies both parts for the 2015 International Workstar.

Part numbers include GATES 31379 and GATES 31410.

This table covers the Hose clamps. Read more

One part is listed for the 2015 International Workstar — DORMAN 9044000.

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

GPD supplies the 5 Intercooler parts for the 2015 International Workstar.

Listed part numbers: GPD 2711613, GPD 2711614 and GPD 2711624, plus the other parts above.

This table covers the Intercooler Air Hose pipes. Read more

GATES supplies the 3 Intercooler Air Hose / Pipe parts for the 2015 International Workstar.

Listed part numbers: GATES 26200, GATES 26203 and GATES 26201.

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

8 Radiator parts are listed for the 2015 International Workstar, from SPECTRA PREMIUM, GPD and OSC.

Economy: 1 part, from GPD. A representative part number is GPD 9282753.

The Standard Replacement section lists 5 options from SPECTRA PREMIUM and OSC — built to original-equipment specification. OSC HD1034 is listed in this group.

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

This group includes GPD 9282753, OSC HD1034 and SPECTRA PREMIUM 20013542 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

12 Radiator Hose parts for the 2015 International Workstar come from 3 brands — GATES, CONTINENTAL and DAYCO. The "Popular" part is GATES 21891.

Standard Replacement: 7 parts, from GATES, CONTINENTAL and DAYCO. A representative part number is GATES 21891.

In the Universal Hose (Straight, Bulk) grade, CONTINENTAL and GATES supply 4 parts: grouped under the catalog's "Universal Hose (Straight, Bulk)" designation — the notes column spells out what sets them apart. A representative part number is CONTINENTAL 57230.

1 further part sits outside the graded sections, with the same engine-level match.

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

One part is listed for the 2015 International Workstar — DORMAN 9047549.

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

6 Thermostat parts for the 2015 International Workstar come from 2 brands — MOTORAD and CALORSTAT. The "Popular" part is MOTORAD 406160.

Listed part numbers: MOTORAD 406160, MOTORAD 406190 and CALORSTAT THS1910582, plus the other parts 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

8 Water Pump parts for the 2015 International Workstar come from 3 brands — FVP, US MOTOR WORKS and GATES.

The Economy section: 1 option from FVP. FVP US89 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 42355HD is listed in this group.

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

This group includes FVP US89, GATES 42355HD and FVP US2203 and the remaining parts above.