Durango 2WD V6-3.7L (2009)
Auxiliary Water Pump: Description and Operation
Auxiliary HVAC Heater Pump - Description
DESCRIPTION
An auxiliary HVAC heater pump (1) is used to provide coolant flow through the front and rear heater cores on the Hybrid Electric Vehicle (HEV)
models when operating the vehicle during both gasoline and electric motor operating modes.
The auxiliary HVAC heater pump is mounted to the right side frame rail (4) in the engine compartment by a bracket (5) and contains an electric motor
that drives a vane-type pump using a magnetic clutch. The pump housing has and electrical connector (6) for the motor and two connections for the
heater hoses (2). The heater hoses are secured to the front of the pump housing by spring-type hose clamps (3).
The auxiliary HVAC heater pump is of the identical design as the electric coolant pump for the Traction Power Inverter Module (TPIM), but is NOT
interchangeable with the TPIM coolant pump due to different pump software.
