Chrysler Concorde 1993, Service Manual, Page: 774 / 820

SUCTION LINE
REMOVAL AND INSTALLATION
(1) Remove refrigerant from the A/C system using
a refrigerant recovery machine.
(2) Remove quick connect clip and disconnect quick
connect at expansion valve end.
CAUTION: Cap all lines that are not being replaced
and cap the expansion valve tubes.
(3) Disconnect line at compressor end using a 6
mm alan wrench.
(4) Remove line by pulling rear end of line up out
of vehicle with compressor end following through the
tie-rod area.
To install, reverse the removal procedure.
EVAPORATOR
The heater housing must be removed from the ve-
hicle when replacing the evaporator.
REMOVAL AND INSTALLATION
(1) Disconnect battery.
CAUTION: The refrigerant must be removed from
the system before removing Heater-A/C housing.
Use a refrigerant recovery machine.
(2) Remove heater housing from vehicle. Refer to
Heater-A/C Housing Removal and Installation in this
section for procedure.
(3) Remove recirculation door actuator.
(4) Remove recirculation Door and housing.
(5) Remove upper housing retaining screws.
(6) Remove upper half of heater housing.
(7) Lift evaporator out of lower housing.
(8) Transfer expansion valve onto new evaporator.
Always use a new gasket when transferring expan-
sion valve. Also transfer evaporator sensor. Place the
evaporator sensor in the same location as on the pre-
vious evaporator.
To install, reverse removal procedure.
EVAPORATOR PROBE
The evaporator probe is a temperature sensing ele-
ment located at the coldest point on the face of the
evaporator. Output from the probe is sampled either
by the engine controller (manual A/C) or the body
controller (ATC). It is used to switch the clutch OFF
before evaporator freeze-up occurs. On manual A/C
systems, the clutch is switched OFF when the probe
temperature reaches 1.1°C. (34°F.). It is allowed to
switch ON when the probe temperature reaches
2.8°C. (37°F.). The ON/OFF settings for the ATC sys-
tem are variable.
The evaporator probe is located on the lower right
side of the heater housing.
REMOVAL
(1) Disconnect battery.
(2) Remove right under panel silencer.
(3) Disconnect wiring connector for evaporator
probe.
(4) At center of heater housing, locate evaporator
probe access plate. Twist the access plate counter
clockwise one-quarter turn and remove plate.
(5) Pull probe out of evaporator core. This plate must
be pushed inside the A/C unit and orientated in such a
way that the plate can be removed.
INSTALLATION
(1) Install new probe into the evaporator. The new
probe must not go into the same hole (in the
evaporator core) that the old probe was re-
moved. The evaporator is manufactured with three
holes for probe insertion. Insert the probe in the
uppermost hole.
(2) Install evaporator probe access panel.
(3) Connect probe wiring harness.
(4) Reconnect battery.
EXPANSION VALVE
The expansion valve is located on the engine side of
the dash panel, near the right shock tower.
The expansion valve can fail in three different posi-
tions (open, closed or restricted).
In a Open Position: this will result in a noisy com-
pressor or no cooling. The cause can be a broken spring,
broken ball or excessive moisture in the A/C system. If
the spring or ball are found to be defective, replace the
expansion valve. If excessive moisture is found in the
A/C system, recycle the refrigerant.
In a Closed Position: There will be low suction
pressure and no cooling. This may be caused by a failed
power dome or excessive moisture in the A/C system. If
the power dome on the expansion valve is found to be
defective replace the expansion valve. If excessive
moisture is found recycle the refrigerant.
A Restricted Orifice: There will be low suction pres-
sure and no cooling. This may be caused by debris in
the refrigerant system. If debris is believed to be the
cause, recycle the refrigerant and replace the expan-
sion valve and receiver/drier.
WARNING: AVOID BREATHING A/C REFRIGERANT
AND LUBRICANT VAPOR OR MIST. EXPOSURE MAY
IRRITATE EYES, NOSE AND THROAT. USE ONLY
APPROVED SERVICE EQUIPMENT MEETING SAE
REQUIREMENTS TO DISCHARGE R-134A SYSTEM.
IF ACCIDENTAL SYSTEM DISCHARGE OCCURS,
VENTILATE WORK AREA BEFORE RESUMING SER-
VICE.
HEATING AND AIR CONDITIONING 24 - 15