Plastic Radiator Tanks

A radiator tank holds coolant as it enters (top tank) or exits (bottom tank) the radiator core. Coolant flows from the top tank through the core's tubes, where heat is dissipated, before collecting in the bottom tank and returning to the engine, maintaining proper operating temperature.

No, a coolant tank (or overflow/reservoir tank) is a separate component that stores excess coolant expelled during heating and reabsorbs it as the system cools. The radiator, including its top and bottom tanks, is the primary heat exchanger that cools the circulating coolant.

Most plastic radiator tanks are manufactured from reinforced nylon or polyamide composites, often glass-filled for added strength and heat resistance. These materials withstand high coolant temperatures and pressure cycles while resisting corrosion common in metal tank alternatives.

Common signs include visible cracks, coolant leaks around the tank seams, discoloration from overheating, or a bulging tank surface. If your equipment shows frequent coolant loss or overheating despite a functioning core, the top or bottom tank is a likely culprit.

Compatibility depends on the specific make and model. We offer OEM-equivalent tanks engineered for precise fitment across major brands including Cummins, Caterpillar, Freightliner, and more, so verifying your part number or equipment model ensures correct fitment.

Lead times vary by part availability, with many standard tanks shipping within a few business days. Specialty or hard-to-find tank models may require additional sourcing time. Contact our team with your part number for accurate availability and shipping estimates.