International DuraStar Coolant Reservoirs

Frequently Asked Questions About International DuraStar Coolant Reservoirs

What does the coolant reservoir do on an International DuraStar?

The coolant reservoir, sometimes called the surge tank or overflow tank, holds extra coolant and allows air and pressure to be released from the cooling system as the engine heats up and cools down. It helps maintain proper coolant levels and gives you a visual way to check fluid levels without opening the radiator cap.

How do I know if my coolant reservoir needs to be replaced?

Common signs include visible cracks or stress marks in the plastic, coolant leaking from the tank itself, a reservoir that will not hold pressure, discoloration from overheating, or a cap that no longer seals properly. If you are topping off coolant frequently but cannot find an external leak elsewhere in the system, the reservoir is worth inspecting closely.

Will a replacement reservoir fit my specific DuraStar model year?

International DuraStar trucks were built across several model years with some variation in cooling system components, so fit can differ depending on year and configuration. Always check the listed year range and part specifications on each product page, and compare against your truck's VIN or original part number before ordering to confirm proper fit.

Is the coolant reservoir sold with a cap, sensor, or mounting hardware included?

This varies by listing. Some reservoirs are sold as the tank only, while others may include the cap or mounting brackets. Check the product description and included parts list on each item before purchasing, and reach out to us if you need clarification on what is included.

Is installation something I can do myself, or does it require a shop?

Many owner-operators and shop technicians replace a coolant reservoir themselves since it typically involves draining some coolant, disconnecting hoses and the cap or sensor wiring, and unbolting the tank from its mounting bracket. If you are comfortable with basic cooling system work and have the right tools, this is often a manageable DIY job. If you are unsure about proper coolant disposal, system bleeding, or your specific setup, having a qualified technician handle it is a safe alternative.