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24 - 28
CONTROLS
BLOWER MOTOR RESISTOR (Continued)
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the silencer panel from right side of
the instrument panel (Refer to 23 - BODY/INSTRU-
MENT PANEL/RIGHT IP SILENCER PANEL -
REMOVAL).
(3) Disconnect the wire harness connector from the
blower motor resistor located on the bottom of the
HVAC housing (Fig. 33).
(4) Remove the two screws that secure the blower
motor resistor to the HVAC housing and remove the
resistor.
Fig. 33 Blower Motor Resistor
1 - BLOWER MOTOR RESISTOR
2 - SCREW (2)
3 - WIRE HARNESS CONNECTOR
4 - HVAC HOUSING
INSTALLATION
(1) Position the blower motor resistor into the bot-
tom of the HVAC housing.
(2) Install the two screws that secure the blower
motor resistor to the HVAC housing. Tighten the
screws to 2 N·m (17 in. lbs.).
(3) Connect the wire harness connector to the
blower motor resistor.
(4) Install the silencer panel to the right side of
the instrument panel (Refer to 23 - BODY/INSTRU-
MENT PANEL/RIGHT IP SILENCER PANEL -
INSTALLATION).
(5) Reconnect the negative battery cable.
EVAPORATOR TEMPERATURE
SENSOR
DESCRIPTION
The evaporator temperature sensor (Fig. 34) is a
thermistor with a sensing probe that is inserted
between the fins of the A/C evaporator at its coldest
point. The evaporator temperature sensor prevents
condensate water on the A/C evaporator from freez-
ing and obstructing A/C system air flow. The sensor
probe is filled with a special silicone-based thermal
grease. Two terminals within a molded plastic con-
nector receptacle on the sensor connect it to the vehi-
cle electrical system through a wire lead and
connector of the HVAC wire harness.
Fig. 34 Evaporator Temperature Sensor
1 - SENSING PROBE
2 - WIRE HARNESS CONNECTOR
OPERATION
The evaporator temperature sensor is a thermistor
that operates on a 5-volt reference signal sent out by
the body control module (BCM). The evaporator tem-
perature sensor connects to the BCM through a two-
wire lead and connector of the HVAC wire harness.
The evaporator temperature sensor monitors the
temperature of the A/C evaporator and changes its
internal resistance in response to changes in the
evaporator temperature. In turn, the change in the
sensors internal resistance changes the reference sig-
nal voltage read by the BCM.
The BCM uses the reference signal voltage as an
indication that conditions are correct to request A/C
operation, should the operator (manually) or the A/C-
heater control (automatically) so desire this function.
In turn, the BCM broadcasts the A/C request on the
programmable communications interface (PCI) bus,
where it is read and processed by the powertrain con-
trol module (PCM). The PCM will check engine cool-
JR
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