Kenworth W900B/W900L Coolant Reservoirs

Frequently Asked Questions About Kenworth W900B/W900L Coolant Reservoirs

Will this coolant reservoir fit both my W900B and W900L, or are the two models different?

Many coolant reservoirs are shared between the W900B and W900L platforms, but tank shape, mounting bracket location, and hose/cap fittings can vary by model year and cab configuration. Always check the listed fitment details or provide your VIN when ordering to confirm the reservoir matches your specific truck.

What material are these reservoirs made from, and how durable is it?

Most coolant reservoirs in this category are made from heavy-duty molded plastic designed to withstand engine heat, pressure cycling, and exposure to coolant chemicals. Some listings also offer aluminum options for added durability and heat resistance. Check the individual product description to see which material is used for a specific reservoir.

How do I know if my old reservoir needs to be replaced instead of repaired?

Common signs that it is time to replace a coolant reservoir include visible cracks, stress fractures around the mounting points, a warped or discolored tank from prolonged heat exposure, or a cap that no longer seals properly and causes coolant loss. If you are seeing coolant levels drop without a visible external leak elsewhere in the cooling system, the reservoir is a likely culprit.

Does the reservoir come with the cap, sensor, and mounting hardware included?

This varies by listing. Some reservoirs are sold as a complete assembly with the cap and mounting bracket included, while others are sold as the tank only. If your truck uses a coolant level sensor, verify whether the reservoir includes a sensor port and whether the sensor itself is included, since not all replacement tanks come with electrical components.

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

Replacing a coolant reservoir is a straightforward job for most owner-operators and shop technicians with basic tools. It typically involves draining or relieving pressure from the cooling system, disconnecting hoses and any sensor wiring, unbolting the old tank from its mounting bracket, and reversing the process with the new unit. If your reservoir integrates with a level sensor or overflow line specific to your engine setup, take extra care to route and seal those connections properly to avoid air pockets or leaks.