Dodge ZB 2005 Service Manual page 1053

24 - 24 CONTROLS
MODE DOOR ACTUATORS (Continued)
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the instrument panel (Refer to 23 -
BODY/INSTRUMENT
PANEL ASSEMBLY - REMOVAL).
(3) Disconnect the wire harness connector from the
floor/defrost and the panel mode door actuator, as
required (Fig. 20).
(4) Remove the three screws that secure each
mode door actuator to the HVAC housing and remove
the actuator, as required.
Fig. 20 HVAC Housing
1 - RECIRCULATION DOOR ACTUATOR
2 - RECIRCULATION-AIR DOOR
3 - HVAC HOUSING
4 - WIRE HARNESS CONNECTOR
5 - BLEND DOOR ACTUATOR
6 - WIRE HARNESS CONNECTOR
7 - FLOOR/DEFROST MODE DOOR ACTUATOR
8 - PANEL MODE DOOR ACTUATOR
9 - WIRE HARNESS CONNECTOR
10 - HVAC HOUSING MOUNTING BRACKET
11 - EVAPORATOR DRAIN TUBE
12 - HEATER CORE
13 - BLOWER MOTOR
14 - A/C EVAPORATOR
15 - HVAC HOUSING MOUNTING STUD
16 - HVAC HOUSING MOUNTING STUD
INSTALLATION
(1) Position the mode door actuators to the top of
the HVAC housing as required. If necessary, rotate
the actuator slightly to align the splines on the
actuator output shaft with those in the mode door or
linkage.
PANEL/INSTRUMENT
(2) Install the three screws that secure each mode
door actuator to the HVAC housing, as required.
Tighten the screws to 2 N·m (17 in. lbs.).
(3) Connect the wire harness connector to the
floor/defrost and panel mode door actuators, as
required.
(4) Install the instrument panel (Refer to 23 -
BODY/INSTRUMENT
PANEL ASSEMBLY - INSTALLATION).
(5) Reconnect the negative battery cable.
RECIRCULATION DOOR
ACTUATOR
DESCRIPTION
The recirculation door actuator is a reversible, 12
volt direct current (DC), servo motor which mechan-
ically positions the recirculation-air door. The recircu-
lation door actuator is located on the left side of the
HVAC air inlet housing.
The recirculation door actuator is contained within
a black molded plastic housing with an integral wire
connector receptacle and three integral mounting
tabs that allow the actuator to be secured with three
screws to the air inlet housing. The recirculation door
actuator also has an output shaft with splines that
connects it to the linkage that drives the recircula-
tion-air door. The recirculation door actuator does
require mechanical indexing to the recirculation-air
door, as it is electronically calibrated by the A/C-
heater control.
OPERATION
The recirculation door actuator is connected to the
A/C-heater control through the vehicle electrical sys-
tem by a dedicated two-wire take out and connector
of the HVAC wire harness. The recirculation door
actuator can move the recirculation-air door in two
directions. When the A/C-heater control pulls the
voltage on one side of the motor connection high and
the other connection low, the recirculation-air door
will move in one direction. When the A/C-heater con-
trol reverses the polarity of the voltage to the motor,
the recirculation-air door moves in the opposite direc-
tion. When the A/C-heater control makes the voltage
to both connections high or both connections low, the
recirculation-air door stops and will not move. The
motor connections also provide a feedback signal to
the A/C-heater control. This feedback signal allows
the A/C-heater control to monitor the operation and
relative position of the recirculation door actuator
and the recirculation-air door. The A/C-heater control
learns the recirculation-air door stop positions during
the calibration procedure and will store a diagnostic
ZB
PANEL/INSTRUMENT