Chrysler 2004 Concorde Service Manual page 1585

LH
EVAPORATOR TEMPERATURE SENSOR (Continued)
Fig. 13 EVAPORATOR PROBE NEEDLE
1 - EVAPORATOR PROBE
quarter turn clockwise to where the tab snaps into
the HVAC case detent. Note that the plate will be
flush with the outside of the HVAC housing.
(3) Turn the plate one-quarter turn counter clock-
wise to seat the locking tab in the HVAC case detent.
(4) Connect the wiring harness connector for the
evaporator probe.
(5) Install the right under panel silencer.
(6) Connect the negative battery cable remote ter-
minal to the remote battery post(Refer to 8 - ELEC-
TRICAL/BATTERY
INSTALLATION).
IN-CAR TEMPERATURE
SENSOR
DESCRIPTION
The Automatic Temperature Control (ATC) in-car
temperature sensor returns electrical signals to the
Body Control Module (BCM). The in-car temperature
sensor is used on ATC equipped vehicles only. The in-
car temperature sensor is made up of two parts. One
part is the in-car sensor aspirator motor assembly,
and the second part is a temperature thermistor. The
in-car sensor aspirator motor assembly attaches to
the back of the ATC Control head (Fig. 14). This
assembly has a small fan and a motor which draws
air through the intake on the front of the ATC con-
trol. The in-car sensor thermistor is located inside of
the ATC Control Head. The in-car sensor aspirator
motor is part of the ATC Control and not a separate
serviceable part. The ATC Control must be replaced
if there is a fault relating to the motor. The in-car
temperature sensor thermistor is part of the ATC
Control and not a separate serviceable part. One
must replace the ATC Control if the ATC self-diag-
SYSTEM/CABLES
nostics indicates a fault code. (Refer to 24 - HEAT-
ING & AIR CONDITIONING - DIAGNOSIS AND
TESTING - SELF DIAGNOSTICS)
Fig. 14 ATC IN-CAR TEMPERATURE SENSOR
1 - ATC IN-CAR TEMPERATURE SENSOR
OPERATION
Air drawn from the passenger compartment by the
in-car sensor aspirator motor assembly, and flows
over the thermistor. The in-car sensor thermistor
changes resistance with air temperature. The BCM
measures this resistance and calculates the tempera-
ture of the air drawn into the ATC Control. The ATC
system then makes adjustments to maintain the opti-
mum passenger compartment comfort. Refer to the
ATC In-Car Sensor Aspirator Motor Operation table
for when the ATC Sensor is operating.
IN-CAR SENSOR ASPIRATOR MOTOR OPERATION
-
CONDITION
IGNITION SWITCH IS
ON
VEHICLE IS DRIVEN,
THEN THE IGNITION
SWITCH IS TURNED
OFF
VEHICLE DOOR IS
OPENED, AND LEFT
OPEN, WITHOUT
TURNING ON THE
IGNITION SWITCH
VEHICLE DOOR IS
OPENED, AND THEN
CLOSED, WITHOUT
TURNING ON THE
IGNITION SWITCH
CONTROLS 24 - 17
MOTOR OPERATION
MOTOR ALWAYS
OPERATES, EVEN
WHEN ATC CONTROL
HEAD OFF BUTTON IS
PUSHED
MOTOR TURNS OFF
WHEN THE IGNITION
SWITCH IS TURNED
OFF
MOTOR WILL TURN ON,
AND THEN TURN OFF
APPROXIMATELY 2
MINUTES FROM THE
TIME THE DOOR WAS
OPENED
MOTOR WILL TURN ON,
AND THEN TURN OFF
APPROXIMATELY 2
MINUTES AFTER THE
DOOR WAS CLOSED