Sprinter 2500 L5-2.7L DSL Turbo (2003)
Heater Core: Description and Operation
The heater core is located in the heater housing, behind the instrument panel. It is a heat exchanger made of rows of tubes and fins.
Engine coolant is circulated through the heater hoses to the heater core whenever the heater water valve is cycled open by the ATC control module. As
the coolant flows through the heater core, heat removed from the engine is transferred to the heater core fins and tubes. Air directed through the heater
core picks up the heat from the heater core fins. The heater water valve controls the heater output air temperature by controlling the amount of heated
engine coolant flowing through the heater core. The blower motor speed controls the volume of air flowing through the heater housing.
The heater core cannot be repaired and, if faulty or damaged, it must be replaced.
