Description

DESCRIPTION

Vehicles equipped with the diesel engine are also equipped with a supplemental cabin heater. This cabin heater is mounted under the vehicle and operates similar to an oil fired furnace. The heater burns small amounts of fuel to provide additional heat to the coolant. Coolant is routed from the engine, to the supplemental cabin heater and then to the front heater core. This provides additional heat to the passenger compartment. The supplemental cabin heater system is interfaced to the vehicles on-board computer systems and DRBIII(R) diagnostics.


The supplemental cabin heater has an electronic control module that monitors the heat output of the heater. The cabin heater operates at full load (5 kW), half load or idle mode (no additional heat) depending on engine coolant temperature.


When ambient temperatures are lower than 15° C (60° F), the supplemental cabin heater automatically operates once each ignition cycle for five minutes. This assures a good fuel supply is always present for the supplemental cabin heater.