301.03.0047.20 Volvo Air Dryer Valve Heater

What does an air dryer valve heater do?

This air dryer valve heater is a critical component for maintaining the integrity of pneumatic brake systems in cold climates. By preventing moisture from freezing within the valve assembly, it ensures consistent air pressure delivery and protects downstream components from ice blockages.

Vehicle and engine compatibility

This component is specifically designed for use in Volvo heavy commercial vehicles, including models such as the NH12, FH12, FM12, and VHD series. It is also compatible with Renault Trucks Magnum units. Whether operating in a tractor unit or a bus, this heater maintains optimal thermal conditions for the air dryer assembly.

Installation and technical requirements

The assembly features an integrated bi-metal thermostat to regulate temperature automatically based on the ambient environment. For proper installation, technicians should verify that the supply voltage matches the vehicle's electrical system (either 12 V or 24 V) and ensure the mounting position on the purge valve body is secure.

Maintenance and troubleshooting

Regular inspection of the heating element and electrical connections is recommended to prevent system failures during extreme temperature drops. Maintaining this component helps avoid moisture-related issues in the braking system of Volvo and Renault Trucks.

OE cross-reference

301.03.0047.20 (Air Dryer Valve Heater Air Dryer Valves) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number II16811004.