21221878 Volvo B9TL D9B Water Pump

What does a water pump do?

This water pump functions as a vital centrifugal component within the engine cooling system, ensuring the continuous circulation of coolant between the engine block and the radiator. Designed for heavy commercial vehicle applications, it maintains stable operating temperatures even under high-load conditions.

Vehicle and engine compatibility

This specific model is compatible with Volvo B9TL vehicles featuring the D9B engine. It is engineered to meet the rigorous demands of bus and heavy-duty engine environments, providing reliable performance throughout its service life.

Installation and maintenance

For optimal performance, technicians should inspect the pump during routine belt or timing belt service. Monitoring for signs such as coolant leaks from the weep hole or unusual bearing noise can help prevent overheating. If replacement is required, ensure all seals are seated correctly to maintain system integrity.

Troubleshooting guidance

Consult your authorized distributor for further information regarding fitment and technical support.

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 21221878.