Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 185
HEATING AND AIR CONDITIONING
CONTENTS
page
page
AUTOMATIC TEMPERATURE CONTROL
(ATC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
COMPONENT SERVICE PROCEDURES
. . . . . . 47
FIXED DISPLACEMENT COMPRESSOR—
MODEL 10PA17
. . . . . . . . . . . . . . . . . . . . . . 24
FIXED DISPLACEMENT COMPRESSOR—
MODEL SD709P
. . . . . . . . . . . . . . . . . . . . . . 38
FIXED DISPLACEMENT COMPRESSOR—
MODEL TR105
. . . . . . . . . . . . . . . . . . . . . . . 32
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1
HEATER AND A/C PERFORMANCE TESTS
. . . . 6
REFRIGERANT SERVICE PROCEDURES
. . . . . . 8
VACUUM CONTROL SYSTEM DIAGNOSIS
. . . . 4
VARIABLE DISPLACEMENT COMPRESSOR—
MODEL 6C17
. . . . . . . . . . . . . . . . . . . . . . . . . 13
GENERAL INFORMATION
INDEX
page
page
A/C System Identification
. . . . . . . . . . . . . . . . . . . 1
Cooling System Precautions
. . . . . . . . . . . . . . . . . 3
Description and Operation
. . . . . . . . . . . . . . . . . . . 1
Engine Cooling System Requirements
. . . . . . . . . . 2
Handling Tubing and Fittings
. . . . . . . . . . . . . . . . . 3
Safety Precautions and Warnings
. . . . . . . . . . . . . 3
Side Window Demisters
. . . . . . . . . . . . . . . . . . . . 2
System Airflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1
A/C SYSTEM IDENTIFICATION
The terms Fixed Displacement Compressor and
Variable Displacement Compressor will be used to
describe the two types of A/C systems used through-
out this Group. Refer to (Figs. 1, 2, 3 and 4).
The Variable Displacement Compressor can be
identified by the location of the high pressure line. It
is mounted to the end of the compressor case (Fig. 4).
DESCRIPTION AND OPERATION
Both the heater and the heater/air conditioning
systems share many of the same functioning compo-
nents. This Group will deal with both systems to-
gether when component function is common, and
separately when they are not.
For proper operation of the instrument panel con-
trols, refer to the Owner’s Manual provided with the
vehicle.
All vehicles are equipped with a common A/C-heat-
er unit housing assembly. On heater only systems,
the evaporator and recirculating air door are omitted
(Fig. 5).
SYSTEM AIRFLOW
The system pulls outside (ambient) air through the
cowl opening at the base of the windshield. Then it
goes into the plenum chamber above the A/C-heater
unit housing. On air conditioned vehicles, the air
passes through the evaporator. Air flow can be di-
rected either through or around the heater core. This
Fig. 1 Fixed Displacement Compressor—Model
10PA17
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HEATING AND AIR CONDITIONING
24 - 1
is done by adjusting the blend-air door with the
TEMP control on the instrument panel. The air flow
can then be directed from the PANEL, BI-LEVEL
(panel and floor), and FLOOR-DEFROST outlets. Air
flow velocity can be adjusted with the blower speed
selector switch on the instrument panel (Fig. 6).
On air conditioned vehicles, ambient air intake can
be shut off by closing the recirculating air door. This
will recirculate the air that is already inside the ve-
hicle. This is done by moving the TEMP control into
the RECIRC position. Depressing the DEFROST or
A/C button will engage the compressor. This will
send refrigerant through the evaporator, and will re-
move heat and humidity from the air before it is di-
rected through or around the heater core.
SIDE WINDOW DEMISTERS
The side window demisters direct air from the
heater assembly. The outlets are located on the top
outboard corners of the instrument panel. The De-
misters operate when the A/C control mode selector
is on FLOOR or DEFROST setting.
ENGINE COOLING SYSTEM REQUIREMENTS
To maintain the performance level of the heating/
air conditioning system, the engine cooling system
must be prepared as shown in this manual.
The use of a bug screen is not recommended. Any
obstructions in front of the radiator or condenser can
reduce the performance of the A/C or engine cooling
system.
Fig. 2 Fixed Displacement Compressor—Model
TR105
Fig. 3 Fixed Displacement Compressor—Model
SD709P
Fig. 4 Variable Displacement Compressor—Model
6C17
Fig. 5 Common Blend-Air Heater A/C System
24 - 2
HEATING AND AIR CONDITIONING
Ä
SAFETY PRECAUTIONS AND WARNINGS
WARNING: WEAR EYE PROTECTION WHEN SER-
VICING THE AIR CONDITIONING REFRIGERANT
SYSTEM. SERIOUS EYE INJURY CAN RESULT
FROM EYE CONTACT WITH REFRIGERANT. IF EYE
CONTACT IS MADE, SEEK MEDICAL ATTENTION
IMMEDIATELY.
DO
NOT
EXPOSE
REFRIGERANT
TO
OPEN
FLAME. POISONOUS GAS IS CREATED WHEN RE-
FRIGERANT IS BURNED. AN ELECTRONIC TYPE
LEAK DETECTOR IS RECOMMENDED.
LARGE AMOUNTS OF REFRIGERANT RELEASED
IN A CLOSED WORK AREA WILL DISPLACE THE
OXYGEN AND CAUSE SUFFOCATION.
THE EVAPORATION RATE OF (R-12) REFRIGER-
ANT AT AVERAGE TEMPERATURE AND ALTITUDE
IS EXTREMELY HIGH. AS A RESULT, ANYTHING
THAT COMES IN CONTACT WITH THE REFRIGER-
ANT WILL FREEZE. ALWAYS PROTECT SKIN OR
DELICATE
OBJECTS
FROM
DIRECT
CONTACT
WITH REFRIGERANT.
CAUTION: Liquid refrigerant is corrosive to metal
surfaces. Follow the operating instructions supplied
with equipment being used.
COOLING SYSTEM PRECAUTIONS
WARNING: ANTIFREEZE IS AN ETHYLENE GLYCOL
BASE COOLANT AND IS HARMFUL IF SWAL-
LOWED OR INHALED. IF SWALLOWED, DRINK
TWO GLASSES OF WATER AND INDUCE VOMIT-
ING. IF INHALED, MOVE TO FRESH AIR AREA.
SEEK MEDICAL ATTENTION IMMEDIATELY.
DO NOT STORE IN OPEN OR UNMARKED CON-
TAINERS.
WASH SKIN AND CLOTHING THOROUGHLY AF-
TER COMING IN CONTACT WITH ETHYLENE GLY-
COL.
KEEP OUT OF REACH OF CHILDREN AND PETS.
DO NOT OPEN A COOLING SYSTEM WHEN THE
ENGINE IS AT RUNNING TEMPERATURE. PER-
SONAL INJURY CAN RESULT.
The engine cooling system is designed to develop
internal pressure of 97 to 123 kPa (14 to 18 psi). Al-
low the vehicle 15 minutes (or until a safe tempera-
ture and pressure are attained) before opening the
cooling system. Refer to Group 7, Cooling System.
HANDLING TUBING AND FITTINGS
Kinks in the refrigerant tubing or sharp bends in
the refrigerant hose lines will greatly reduce the ca-
pacity of the entire system. High pressures are pro-
duced in the system when it is operating. Extreme
care must be exercised to make sure that all connec-
tions are pressure tight. Dirt and moisture can enter
the system when it is opened for repair or replace-
ment of lines or components. The refrigerant oil will
absorb moisture readily out of the air. This moisture
will convert into acids within a closed system.
The following precautions must be observed:
The system must be completely empty before open-
ing any fitting or connection in the refrigeration sys-
tem. Open fittings with caution even after the
system has been emptied. If any pressure is noticed
as a fitting is loosened, allow trapped pressure to
bleed off very slowly.
A good rule for the flexible hose lines is to keep the
radius of all bends at least 10 times the diameter of
the hose. Sharper bends will reduce the flow of re-
frigerant. The flexible hose lines should be routed so
they are at least 3 inches (80 mm) from the exhaust
manifold. Inspect all flexible hose lines to make sure
they are in good condition and properly routed.
Unified plumbing connections with aluminum gas-
kets cannot be serviced with O-rings. These gaskets
are not reusable and do not require lubrication be-
fore installing.
The use of correct wrenches when making connec-
tions is very important. Improper wrenches or im-
proper use of wrenches can damage the fittings.
The A/C system will remain chemical stabile as
long as pure-moisture-free R-12 and refrigerant oil is
used. Abnormal amounts of dirt, moisture or air can
upset the chemical stability. This condition could
cause operational troubles or even serious damage if
present in more than very small quantities.
When it is necessary to open the refrigeration sys-
tem, have everything needed to service the system
ready. The system should not be left open any longer
than necessary. Cap or plug all lines and fittings as
soon as they are opened to prevent the entrance or
dirt and moisture. All lines and components in parts
stock should be capped or sealed until they are ready
to be used.
All tools, including the refrigerant dispensing man-
ifold, the manifold gauge set, and test hoses should
be kept clean and dry.
Fig. 6 Heater only or Heater—A/C Controls
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HEATING AND AIR CONDITIONING
24 - 3
VACUUM CONTROL SYSTEM DIAGNOSIS
GENERAL INFORMATION
Use an adjustable Vacuum Test Gauge (C-3707)
and a suitable vacuum pump to test heater A/C con-
trol vacuum. With a finger placed over the end of
test hose (Fig. 1), calibrate vacuum control valve on
the test gauge to obtain -27 kPa (8 in. Hg.). Release
and block the end of the test hose several times to
verify vacuum setting.
VACUUM TESTING THE ONE-WAY CHECK VALVE
(1) In the engine compartment, disconnect the
Heater-A/C vacuum supply (black) hose. This hose
passes through an opening in the dash panel used for
the air conditioning expansion valve.
(2) Remove the vacuum check valve. This valve is
located on the (black) vacuum supply hose at the
brake power booster.
(3) Connect test vacuum supply hose to the heater
side of the valve. In this direction the gauge should
return to calibrated setting. If valve leaks vacuum in
this direction, valve replacement is necessary.
(4) Connect test vacuum supply hose to the engine
vacuum side of the valve. Vacuum should flow
through valve.
VACUUM TESTING THE HEATER-A/C CONTROLS
(1) Connect the test vacuum prod to the vehicles
(black) vacuum supply hose. Position vacuum test
gauge so it can be viewed from the passenger com-
partment.
(2) Position the heater A/C control mode selector to
DEFROST, FLOOR, BI-LEVEL, PANEL, and RE-
CIRC (with A/C). Pause after each selection. The test
gauge should return to the calibrated setting of -27
kPa (8 in. Hg.) after each selection is made. If the
gauge cannot achieve the calibrated setting, a vac-
uum circuit or component has a leak.
LOCATING VACUUM LEAKS
To locate a vacuum leak, disconnect 7-way vacuum
connector behind the instrument panel at the heater
A/C control. For removal and installation of heater
A/C control panel, refer to the Switch and Panel
Component Service section of Group 8E, Instrument
Panel. Connect the calibrated vacuum hose prod (Fig.
4) to each port in the vacuum harness connector (Fig.
2). The brown, bi-level, vacuum circuit has a metal
fiber restrictive device located in the line. More reac-
tion time is required for the test gauge to return to
calibrated setting. After each connection is made, the
test gauge should return to calibrated setting. If all
circuits function properly, replace control mode vac-
uum switch. If not, determine the color of the vac-
uum circuit that is leaking. To determine vacuum
line colors, refer to the Vacuum Circuits-Heater or
Heater A/C Control chart in this section. Disconnect
the vacuum actuator at the other end of the circuit.
(Instrument panel removal may be necessary to gain
access to some components). Block the end of the dis-
connected vacuum line. The test gauge should return
to calibrated setting. If not, that circuit has a leak
and must be repaired or replaced. If test gauge re-
turns to calibrated setting, the vacuum actuator
must be replaced.
Fig. 1 Adjust Vacuum Test Bleed Valve
Fig. 2 Vacuum Circuit Test
24 - 4
HEATING AND AIR CONDITIONING
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