Removal; Installation; Blend Door Actuator Description; Operation - Dodge Dakota Sport 2001 Service Manual

AN
AMBIENT TEMP SENSOR (Continued)
circuit cavities of the HVAC control harness connec-
tor. There should be continuity. If OK, go to Step 4. If
not OK, repair the open sensor return circuit or
ambient temperature sensor signal circuit to the
ambient temperature sensor as required.
(4) Check for continuity between the ambient tem-
perature sensor signal circuit cavity of the HVAC
control harness connector and a good ground. There
should be no continuity. If OK, refer to Diagnosis and
Testing of the Compass Mini-Trip Computer in
this section. If not OK, repair the shorted ambient
temperature sensor signal circuit as required.

REMOVAL

(1) Disconnect and isolate the battery negative
cable.
(2) Locate the ambient temperature sensor, on the
right side of the radiator yoke behind the grille (Fig.
17).
Fig. 17 Ambient Temperature Sensor Remove/Install
1 - YOKE
2 - CONNECTOR
3 - SCREW
4 - SENSOR
(3) Disconnect the wire harness connector from the
ambient temperature sensor connector receptacle.
(4) Remove the one screw that secures the ambient
temperature sensor bracket to the radiator yoke.
(5) Remove the ambient temperature sensor from
the radiator yoke.

INSTALLATION

(1) Position the ambient temperature sensor onto
the radiator yoke.
(2) Install and tighten the one screw that secures
the ambient temperature sensor bracket to the radi-
ator yoke. Tighten the screw to 5.6 N·m (50 in. lbs.).
(3) Reconnect the wire harness connector to the
ambient temperature sensor connector receptacle.
(4) Reconnect the battery negative cable.
BLEND DOOR ACTUATOR
DESCRIPTION
The blend door actuators are reversible, 12-volt
Direct Current (DC), servo motors. Models with the
single zone heater and air conditioner system have a
single blend air door, which is controlled by a single
blend door actuator. Models with the optional dual
zone front heater and air conditioner system have
dual blend air doors, which are controlled by two
blend door actuators. The single zone blend door
actuator is located on the driver side end of the heat-
er-A/C housing unit, close to the dash panel. In the
dual zone system, the same blend door actuator used
for the single zone system becomes the passenger
blend door actuator, and is mechanically connected to
only the passenger side blend air door. In the dual
zone system, a second separate blend door actuator is
also located on the driver side end of the heater-A/C
housing unit close to the instrument panel, and is
mechanically connected to only the driver side blend
air door.
The blend door actuators are interchangeable with
each other, as well as with the actuators for the
mode door and the recirculation air door. Each actua-
tor is contained within an identical black molded
plastic housing with an integral wire connector
receptacle. Two integral mounting tabs allow the
actuator to be secured with two screws to the heater-
A/C unit housing. Each actuator also has an identical
output shaft with splines that connects it to the link-
age that drives the proper blend air door. The blend
door actuators do not require mechanical indexing to
the blend door linkage, as they are electronically cal-
ibrated by the heater-A/C control module. The blend
door actuators cannot be adjusted or repaired and, if
damaged or faulty, they must be replaced.

OPERATION

Each blend door actuator is connected to the heat-
er-A/C control module through the vehicle electrical
system by a dedicated two-wire take out and connec-
tor of the HVAC wire harness. The blend door actua-
tor can move the blend air door in two directions.
When the heater-A/C control module pulls the volt-
age on one side of the motor connection high and the
other connection low, the blend air door will move in
one direction. When the module reverses the polarity
CONTROLS 24 - 19