International WorkStar Engine Parts & Cooling

Frequently Asked Questions About International WorkStar Engine Parts & Cooling

What year models are these engine parts and cooling components compatible with?

Our International WorkStar engine parts and cooling components are designed to fit WorkStar models from 2008 through 2017. Most parts are compatible across the entire production run, but some components like radiators and fan clutches may have variations between early models (2008-2011) and later models (2012-2017). Always check the specific part listing for exact year compatibility, or contact our support team with your OEM for verification.

How difficult is it to replace the radiator or cooling fan on my WorkStar?

Radiator replacement typically requires 3-4 hours for an experienced mechanic and involves draining coolant, disconnecting upper and lower hoses, transmission cooler lines (if equipped), and removing the fan shroud. The most challenging aspect is usually accessing the lower mounting bolts. For cooling fan replacement, expect 1-2 hours of work. You'll need basic hand tools, a drain pan, and new coolant. We recommend having a second person help support the radiator during removal and installation to prevent damage.

What's the difference between OEM and aftermarket cooling parts for my WorkStar?

OEM parts are manufactured to International's exact specifications and typically carry a higher price point but offer guaranteed fit and performance. Our aftermarket options from brands like Dorman and TYC meet or exceed OEM specifications while offering cost savings of 30-50%. Aftermarket radiators use the same aluminum core construction and tank materials as OEM units. The main differences are usually in warranty length (1-2 years for aftermarket vs. 3 years for OEM) and minor cosmetic details that don't affect performance.

Why is my WorkStar running hot even after replacing the thermostat?

Overheating issues often involve multiple cooling system components. Beyond the thermostat, common culprits include a clogged radiator (especially in the lower tanks), faulty fan clutch not engaging properly, worn water pump impeller, or air pockets in the cooling system after service. Check for debris blocking the radiator fins, verify the fan clutch engages when the engine is hot, and ensure the cooling system was properly bled after service. The WorkStar's MaxxForce engines are particularly sensitive to proper coolant flow and air elimination.

What coolant type should I use, and how much does the system hold?

International WorkStar trucks require Extended Life Coolant (ELC) meeting International's specifications, typically a nitrite-free OAT (Organic Acid Technology) formula. Most WorkStar models with MaxxForce engines hold between 44-52 quarts of coolant depending on engine size and configuration. Never mix conventional green coolant with ELC red/pink coolant as this can cause gel formation and system damage. When doing a complete flush, remember to include the heater core capacity and use only distilled water for mixing if using concentrate.