Voyager V6-3.3L VIN 3 Flex Fuel (2003)
The combustion air fan delivers the air required for combustion from the combustion air inlet to the burner insert.
Burner Housing
The burner housing includes the:
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coolant inlet
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coolant outlet
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exhaust outlet
The burner housing accommodates the burner insert and is combined with the control unit/heat exchanger as an assembly.
Burner Insert
The burner insert includes the:
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combustion pipe fuel cross section
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glow plug/flame sensor
Inside the burner insert, fuel is distributed across the combustion-pipe fuel cross section. Combustion of the fuel/air mixture takes place within the
combustion pipe to heat the exchanger. The glow plug/ flame sensor, located in the burner insert, ignites the fuel/air mixture during heater start up.
After heater start up, the glow plug/flame sensor operates in the flame sensor function. The glow plug/flame sensor is an electrical resistor by design,
and is located in the burner insert opposite the flame side.
Control Unit/Heat Exchanger
The control unit/heat exchanger includes the:
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control unit
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temperature sensor
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overheat protection
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heat exchanger
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connector terminal
The control unit controls and monitors combustion operation. The control unit is ventilated by means of a ventilation hose routed from the combustion
air collector compartment of the burner. The heat exchanger transfers the heat generated by combustion to the coolant circuit. The control unit/ heat
exchanger and the burner housing are an assembly and must not be disassembled.
The temperature sensor senses the coolant temperature in the heat exchanger as an electrical resistance. This signal is sent to the control unit for
processing.
The overheat protection, controlled by the temperature resistor, protects the heater against undue operating temperatures. The overheat protection will
switch the heater off if the water temperature exceeds 105 °C (221 °F).
Dosing Pump
The dosing pump is a combined delivery, dosing, and shut-off system for the fuel supply of the heater. The dosing pump receives its supply of fuel
from the vehicle's fuel tank.
Operation
OPERATION
Venting the DCHA'S Exhaust
WARNING:
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DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH AS A GARAGE THAT DOES NOT HAVE EXHAUST
VENTILATION FACILITIES. ALWAYS VENT THE DCHA's EXHAUST WHEN OPERATING THE DCHA. FAILURE TO
FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR DEATH.
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ALLOW THE DCHA ASSEMBLY TO COOL BEFORE PERFORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT.
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
CAUTION: When using a powered exhaust ventilation system, do not attach the exhaust ventilation hose directly to the DCHA exhaust pipe. Too
much suction can prevent DCHA operation.
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When using a powered exhaust ventilation system, affix the ventilation hose to the DCHA exhaust pipe or to the vehicle in such a manor that the
end of the ventilation hose remains approximately three inches away from the end of the DCHA exhaust pipe.
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When using a non-powered exhaust ventilation system, affix the ventilation hose directly to the DCHA exhaust pipe.
Activation
When the ignition is in Run, the FCM monitors the PCI bus for the Cabin Heater Activation request. The Automatic or Manual Temperature Control
initiates this request only when all conditions for Cabin Heater activation are favorable (see below). The request carries the status bit that the FCM
