Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 197

(5) Carefully pull the resistor block straight out

from the cowl plenum opening and remove the resis-
tor block from the vehicle.

To install, reverse the preceding operation. The

coils on the Resistor Block should not be contacting
one another. Before installation, gently separate the
coils (with fingers only) if one coil is contacting an-
other.

AA, AP, AY, AND AC BODY

(1) Raise the hood and remove the windshield

wiper arm assemblies.

(2) Remove

five

cowl-plenum

grille

attaching

screws and carefully lift the grille from the vehicle.

(3) (AA and AP): Locate and remove four air in-

take shield attaching screws and lift the shield from
the vehicle.

(4) (AC and AY): Remove two resistor block termi-

nal cover screws and remove cover.

(5) Disconnect the wire connector from the resistor

block located behind the windshield washer reservoir
(Fig. 7).

(6) Remove two blower resistor block attaching

screws. Then carefully pull the resistor block forward
until the coils clear the plenum and lift it from the
vehicle.

To install, reverse the preceding operation. The

coils on the Resistor Block should not be contacting
one another. Before installation, gently separate the
coils (with fingers only) if one coil is contacting an-
other.

VACUUM ACTUATOR—FRESH/RECIRC DOOR

This actuator is located on the passenger side of

the heater-A/C housing.

REMOVAL AND INSTALLATION

(1) AA, AC or AY Body: Remove silencer cover un-

der the instrument panel (below glove box).

(2) Remove glove box assembly. Refer to Group 8E,

Instrument Panel.

(3) Disconnect vacuum lines.
(4) Locate and remove the two vacuum actuator at-

taching screws.

(5) Disengage the actuator arm linkage from the

door pivot and remove the vacuum actuator (Fig. 8)
from vehicle.

To install, reverse the preceding operation.

AIR DISTRIBUTION DUCT

REMOVAL AND INSTALLATION

AA BODY

On AA Body the instrument panel must be rolled

down to service duct. Refer to Group 8E, Instrument
Panel.

AC, AP, AY BODY

(1) Remove lower instrument panel module. Refer

to Group 8E, Instrument Panel.

(2) Remove distribution duct attaching screws from

under the front edge of the instrument panel (Fig. 9).

(3) Slide duct downward and remove from vehicle.
To install, reverse the preceding operation.

Fig. 6 Blower Resistor Block Location—AJ and AG

Body

Fig. 7 Blower Resistor Block Location—AA, AP, AY

and AC Body

Fig. 8 Recirculating Air Door Vacuum

Actuator—Typical

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HEATING AND AIR CONDITIONING

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DEFROSTER DUCT ADAPTER

REMOVAL AND INSTALLATION

AA BODY

On AA body, the instrument panel must be rolled

down to service duct. Refer to Group 8E, Instrument
Panel.

AC, AP, AY BODY

(1) Remove air distribution duct.
(2) Separate the defroster adapter from the heater-

A/C unit and pull the adapter downward and out
from under the instrument panel.

To install, reverse the preceding operation.

DEFROSTER DUCT

REMOVAL AND INSTALLATION

AA, AG, AND AJ BODY

On AA, AG, and AJ Body, the instrument panel

must be rolled down to service duct. Refer to Group
8E, Instrument Panel.

AC, AP, AY BODY

(1) Remove the air distribution duct.
(2) Remove the defroster duct adapter.
(3) Remove the instrument panel top cover. Refer

to Group 8E, Instrument Panel.

(4) Locate and remove defroster duct attaching

screws at the ends of each outlet (Fig. 10).

(5) Allow the defroster duct to drop downward and

remove it from the vehicle.

To install, reverse the preceding operation.

HEATER HOSES

REMOVAL AND INSTALLATION

Review Cooling System Precautions before

proceeding with this operation.

(1) Drain engine cooling system. Refer to Group 7,

Cooling System.

(2) Loosen clamps at each end of hose to be re-

moved (Figs. 11 or 12).

(3) Carefully rotate hose back and forth while tug-

ging slightly away from connector nipple.

CAUTION: When removing hoses from heater core
inlet or outlet nipples DO NOT exert excess pres-
sure. The heater core may become damaged and
leak engine coolant into heater-A/C unit.

Fig. 9 Air Distribution Ducts—Typical

Fig. 10 Removing or Installing Defroster

Duct—Typical

Fig. 11 Heater Hose Routing—2.2 L, 2.5 L

Engines—Typical

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HEATING AND AIR CONDITIONING

24 - 51

To install, reverse the preceding operation.

VACUUM ACTUATORS—MODE DOORS

The Vacuum Actuators for the Mode Doors are lo-

cated on the drivers side of heater/AC housing above
the accelerator pedal.

REMOVAL

(1) Remove the instrument panel cover under the

steering column. Refer to Group 8E, Instrument
Panel.

Heat/Defrost Actuator:
Remove two screws from bracket. Lift actuator up-

ward and pull out (Fig. 13).

Mode Door Actuator:
Remove two screws from bracket (Fig. 14). Rotate

actuator counter-clockwise to unhook from door and
pull to remove.

INSTALLATION

Heat/Defrost Actuator:

Install actuator link through housing and insert in

heat defrost door slot. Push down to hook link to
door. Locate the bracket to the housing and install
two screws.

Mode Door Actuator:
Insert the actuator shaft through the hole in the

housing

and

heat/defrost

door.

Attach

through

mounting hole in the mode door. Install two screws
in bracket.

Install the instrument panel cover under the steer-

ing column.

AIR DISTRIBUTION DUCT

REMOVAL AND INSTALLATION

(1) Instrument panel assembly must be removed.

Refer to Group 8E, Instrument Panel.

(2) After instrument panel has been removed, sep-

arate the defroster/demister ducts from the air distri-
bution duct.

(3) Remove the air distribution duct-to-instrument

panel mounting screws (Fig. 15).

To install, reverse removal procedure.

DEFROSTER DUCTS/DEMISTER DUCTS AND
HOSES

REMOVAL AND INSTALLATION

(1) Instrument panel assembly must be removed.

Refer to Group 8E, Instrument Panel.

(2) After instrument panel has been removed, sep-

arate the defroster/demister ducts from the air distri-
bution duct.

(3) Remove the demister tubes and hoses (Fig. 16).
To install, reverse removal procedure.

Fig. 12 Heater Hose Routing—3.0 L Engine—Typical

Fig. 13 Removing or Installing Heat/Defrost Vacuum

Actuator Assembly

Fig. 14 Mode Door Vacuum Actuators

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FIN-SENSING CYCLING CLUTCH SWITCH

The Fin-Sensing Cycling Clutch Switch (FCCS)

(Fig. 17) is located in the heater-A/C unit housing
near the blower motor and placed in the evaporator
fins. The FCCS prevents evaporator condensate
freeze-up. This is done by cycling the compressor
clutch OFF when evaporator temperature drops be-
low freeze point. It cycles ON when the evaporator
temperature rises above freeze point. The FCCS uses
a thermistor probe in a capillary tube inserted be-
tween the evaporator fins in the heater-A/C unit
housing. If the compressor clutch does not cycle, and
all other clutch circuit components test correct, test
the switch.

At temperatures above 32°C (90°F) the compressor

clutch may engage continuously and not cycle. This
is due to evaporator temperature above the freezing
point.

DIAGNOSIS

The work area and vehicle must be between 21°C

(70°F) and 32°C (90°F) when testing the Fin-sensing
Cycling Switch.

(1) Disconnect the 3-wire connector from switch

lead located behind the glove box.

(2) Test for voltage between pin #1 to pin #3 on

the wire harness connector (Fig. 18). If voltage is not
detected, refer to the Front Wheel Drive Car-Wiring
Diagrams Service Manual. If voltage is detected,
jump pin #1 to pin #3 using a jumper wire. Com-
pressor clutch should engage.

(3) If compressor clutch engages, test for continuity

from terminal pin #1 to pin #3 of the switch lead
connector. Continuity should be detected. If not, re-
place the Fin-sensing Cycling Clutch Switch.

REMOVAL AND INSTALLATION

(1) Remove the cover/housing from the heater-A/C

blower motor. Refer to Blower Motor removal and in-
stallation. Remove the cover only. Blower motor or
blower motor wheel removal is not necessary.

(2) Disconnect the (three pin) wiring pigtail con-

nector from the clutch switch sensor harness (located
on the outside of the A/C-heater housing). Push the
wire harness grommet (attached to the A/C-heater

Fig. 15 Air Distribution Duct

Fig. 16 Defroster Ducts/Demister Ducts and Hoses

Fig. 17 Fin-sensing Cycling Clutch Switch

Fig. 18 Fin-sensing Cycling Clutch Switch Harness

Connector

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