21218878 Volvo FMX D13K Water Pump

What does a water pump do?

The water pump plays a critical role in the engine cooling system by circulating coolant between the engine block and the radiator. This constant flow prevents overheating and ensures that the engine maintains its ideal operating temperature even under high thermal loads typical of heavy commercial vehicles.

Vehicle compatibility and engine fitment

This specific model is designed for Volvo FMX trucks equipped with D13K engines, as well as various Volvo FM models including the FM 480, FM 440, FM 380, FM 340, FM 300, FM 400, FM 360, FM 390, and FM 430. It provides precise flow control to support long-haul and construction applications.

Installation and maintenance guidance

For optimal performance and to prevent sudden engine overheating, technicians should inspect the pump during routine belt or cooling system service. When replacing this component, it is recommended to check the condition of the gaskets and seals to ensure a leak-free installation. Check the compatibility list for your specific engine configuration.

Troubleshooting and replacement

Monitoring for symptoms such as coolant leakage from the weep hole or unusual bearing noise can help in early detection of component wear. Replacing a worn pump promptly helps protect the entire cooling system from potential damage caused by cavitation or thermal stress.

OE cross-reference

525.03.0006 (Water Pump Water Pumps) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21218878.