air conditioner MITSUBISHI ECLIPSE 1991 Repair Manual

24-18 HEATERS AND AIR CONDITIONING - Service Adjustment Procedures
(5) Screw a can of R-12 to the opened manifold valve. Be sure
gasket is in place and in good condition. Tighten refrigerantcan and manifold locking nut to insure a good seal. Do not
overtighten 8 to
11 Nm (6 to 8 ft.lbs.) is sufficient if gasket
is in good condition.
(6) Turn manifold valve (above the refrigerant can) completely
clockwise to puncture the can. This closes the valve and
seals the refrigerant in the can.
Caution
Never heat small cans of refrigerant over
40°C (104°F)as they may explode.
(7) Place the refrigerant in a large pan of water heated to 52°C
(104°F). Place pan of water containing the refrigerant can
on an accurate scale so the amount of refrigerant added
can be weighed. Open the refrigerant manifold valve.
(8) Purge all air from test hoses. Air in the system will be
trapped in the condenser causing abnormally high dis-
charge pressures and interfering with condensing of the
refrigerant.(9) Slightly loosen both test hoses at the gauge set manifold.
Tighten the hoses as soon as the air is purged.
(10)Slightly loosen charging hose connection at gauge set
manifold. This will purge air from the charging hose.
Tighten connection as soon as air is purged.
(I l)With vehicle windows open and hood up, operate engine at1,500 rpm and jump the low pressure switch terminals
located on the receiver drier so the clutch will remain
engaged.
(12)Place air conditioner control on air conditioner and place theblower switch on high.
(13)lf necessary, block the condenser to maintain a discharge
pressure of 1,422 to 1,520
kPa (206 to 220 psi). System
must be charged through the evaporator suction service
ports as follows:
(a) Slowly open the suction service gauge valve.
Meter flow of refrigerant by adjusting, the suciton
service gauge valve so that pressure registered at the
suction service gauge does not exceed 345 kPa (50 psi).Keep refrigerant container upright.
(b) Add refrigerant gas until there is no foam visible at the
sight glass.
Add an additional
170 g (6 oz.)
(c) Close the suction gauge valve.
CautionToo much refrigerant in the system can cause
abnormally high discharge pressures. Care must beused so that the exact recommended amount or
refrigerant is added after foam clears in the sight
glass.(d) Close dispensing manifold valve. Remove test hoses
and adapters from the service ports of compressor,
install protective caps at service ports and reconnect
wiring.(e) Check system performance.
(P.24- 16.)
e
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HEATERS AND AIR CONDITIONING - Service Adjustment Procedures 24-21Hot water40°C (104°F)
1467CHARGING SYSTEM
The refrigerant system must have been evacuated using the
previous procedure before charging.
Charge using only R-l 2 refrigerant.
R-12 is available in bulk
tanks or small cans. Follow the safety precautions for handling
R-12 as listed in this group.
Charging with Small Cans
When using disposable cans of this type, follow carefully the
can manufacturers instructions.
Caution
Never use these cans to charge into the high pressure side
of the system (compressor discharge port) or into a systemthat is at high temperature, because the high system
pressures could be transferred into the charging can
causing it to explode.
Keep the refrigerant manifold valves capped when not in use.
Keep a supply of extra refrigerant-can-to-refrigerant-manifold
gaskets on hand so that gaskets can be replaced periodically.
This will insure a good seal without excessive tightening of thecan or the manifold nuts.
(1) Attach center hose from manifold gauge set to refrigerant
dispensing manifold. Turn refrigerant manifold valves com-pletely anticlockwise so they are fully open.
Remove protective caps from refrigerant manifold.
(2) Screw refrigerant cans into manifold. Be sure
manifold-to-can gasket is in place and in good condition. Tighten can
and manifold nuts to 8 to 11 Nm (6 to 8
ft.lbs.).(3) Turn refrigerant manifold valves completely clockwise to
puncture the cans and close the manifold valves.
(4) Purge the air from the charging line by loosening the
charging hose at the gauge set manifold and turning one ofthe refrigerant valves anticlockwise to release refrigerant.
When the refrigerant gas starts escaping from the loose
connection, re-tighten the hose.
Caution
Never heat small refrigerant cans over
40°C (104°F) as
they may explode.
(5) Fully open all refrigerant manifold valves being used and
place the cans of refrigerant into a pan containing
40°C
(104°F) water. The water will warm the charging can and
aid in the transfer to the charge into the system. Place the
water pan and refrigerant cans on a scale and note the
weight.
(6)Place air conditioner control on air conditioner and place theblower switch on high.
(7) Open the discharge and suction gauge valves of the gaugemanifold, and charge gas from the both.
Keep refrigerant container upright.
(8) When suction of refrigerant is saturated, close the dis-
charge and suction gauge valves once, and start the
engine. Fix the engine revolution speed at approx. 1,500
rpm.

HEATERS AND AIR CONDITIONING - Service Adjustment Procedures 24-25
16A1077
20AO499
CONDENSER FAN MOTOR HIGH-LOW SELECTING RELAYCheck for continuity between the
term,inals when the battery
power-supply is applied to terminal
(5), and terminal (3) is
grounded.
IWhen current flows1 Between terminals l-2 1 Continuity1When no current
flows
IDLE-UP OPERATION CHECKN24FoAA
(I) Before inspection and adjustment set vehicle in the
following condition:
l Engine coolant temperature:
80-90°C (176-194°F)
lLights, electric cooling fan and accessories: Set to OFFl Transaxle: Neutral
(N or P for vehicles with A/T)l Steering wheel: Straightforward
(2) Check whether or not the idling speed is the standard
value.Standard value:
4.8L Engine>700 rpm
<2.0L DOHC Engine>750 rpm
NOTE
There is no necessity to make an adjustment, because theidling speed is automatically adjusted by the
ISC” system.
If, however, there occurs a deviation from the standard
value for some reason, check the
ISC” system.
(3) Check to be sure that the idlig speed becomes the standardvalue when the air conditioner switch is switched ON and
the air conditioner is activated.
Standard value: 850 rpm
NOTE
There is no necessity to make an adjustment, because theidling speed is automatically adjusted by the
ISC” system.
If, however, there occurs a deviation from the standard
value for some reason, check the
ISC” system.
ISC: Idle Speed Control

24-30HEATERS AND AIR CONDITIONING - Air Conditioner SwitchAIR CONDITIONER SWITCH
REMOVAL AND--N24OA..INSTALLATION
-2OAO419al Operationof
R;tdio and TanePlaver@Removal -..--._ _.-.-, -Removal steps
I. Air conditioner switch connectorCL7 Air rnnditinner switch
l Installation of Radio and Tape Player(Refer to GROUP 8-Audio System.)
NOTEOperation /Reverse
removal orocedures to reinstall.
I
77-. , .,a -.,a ,-,..-,.-. -.....,. ,.._._.__ _..- .-...-.-.r----- --
-----A
20A0427
20A0199
SERVICE POINTS OF REMOVALN24QBAF2. REMOVAL OF AIR CONDITIONER SWITCH
Remove the radio set, and insert hand to the back of the
cluster panel assembly through the produced opening.
Catching the air conditioner switch on the right and left
sides, push it toward you for removal.
INSPECTIONN24OCACaAIR CONDITIONER SWITCH CHECK
(1) Remove the heater control panel.
(2) Remove the connector for the air conditioner switch, and
then check for continuity as described below.
NOTE(1) The 0-0 symbol indicates continuity.
(2) The broken line (-----) indicates the connection
during ECONOMY use.
(3) The chain line
(- -----) indicates the connection
during air conditioner use.

HEATERS AND AIR CONDITIONING - Heater Unit24-31
HEATER UNIT
REMOVAL AND INSTALLATIONN24m-
Pre-removal OperationeDraining of Engine Coolant(Refer to GROUP 7-Service Adjust-ment Procedures.)
@Removal of Floor Console and In-
strument Panel
(Refer to GROUP 23-Floor Consoleand Instrument Panel.)Post-installation Operation
*Supplying of Coolant
(Refer to GROUP 7-Service Adjust-ment Procedures.)
l installation of Floor Console and
Instrument Panel
(Refer to GROUP 23-Floor Consoleand Instrument Panel.)


shower duct>
Jshower duct>
Removal steps
1. Center reinforcement
2. Shower duct (R.H.)
3. Distribution foot duct
;: ;Z;;er duct assembly
:z6. Evaporator
7. Heater unit
8. Lap cooler duct (A)
NOTE(1) Reverse the removal procedures to reinstall.(2) 4* : Refer to “Service Points of Removal”.

24-32HEATERS AND AIR CONDITIONING - Heater Unit
SERVICE POINTS OF REMOVAL6. REMOVAL OF
EVAPORATERRefer to GROUP 24-34.
NMISAO
20A04177. REMOVAL OF HEATER UNIT

NOTEIn order to prevent bolts from falling into the blower
assembly, set the inside/outside air-selection damper to
the position that permits outside air introduction.
INSPECTIONN24lcAal Check the operation of dampers and link mechanism.
l Check the heater core for clogging and water leakage.
HEATER CORE REPLACEMENT
(1) Remove the heater unit.
(2) Remove the plate.N24lDAH
(3) Pull out the heater core from the heater unit.
(4) Insert the heater core into the heater unit.
NOTEThis work must be done carefully so as not to damage the
fin part or the pad part.
(5)
Install the plate.
(6) Install the heater unit.

24-34HEATERS AND AIR CONDITIONING - Evaporator
EVAPORATOR
REMOVAL AND INSTALLATION
1 Pre-removal Operation1aDischarge of Refrigerant
(Refer to P.24.19.)Post-installation Operation
l charging of Refrigerant(Refer to P.24-21.)l Checking for Refrigerant Ga:(Refer to
P.24-16.)Removal steps
N l +1. Liquid pipe and suction hose connection2. O-ring
3. Stopper
4. Glove box
5. Lower frame
6. Shower duct R.H.
7. Body wiring harness and air conditioner
wiring harness connection
8. Air conditioner control unit
9. Drain hose
10. Evaporater
2OAO424
NOTE(1) Reverse the removal procedures to reinstall.
(2) ++ : Refer to “Service Points of Removal”.
(3) l : Refer to “Service Points of Installation”.
SERVICE POINTS OF REMOVALN24RBAHa1. DISCONNECTION OF LIQUID PIPE AND SUCTION
HOSEIf the hoses or pipes are disconnected, cap the hoses or
pipes with a blank plug to prevent entry of dust, dirt, and
water.
INSPECTIONN24RCAAl Check for damage of the evaporator fin part.
l Check for damage or collapse of the drain hose.
l Check for peeling or cracking of the insulator.
AIR-OUTLET SENSOR AND AIR-INLET SENSOR CHECK
For information concerning the checking procedures, refer to
P.24-13.
SERVICE POINTS OF INSTALLATIONN24RDAK1. CONNECTION OF LIQUID PIPE AND SUCTION HOSE
For information concerning the installation procedures,
refer to
P.24-23.

HEATERS AND AIR CONDITIONING - Evaporator
DISASSEMBLY AND REASSEMBLY
24-35
NURE--
3ZOAO457Disassembly steps
1. Wiring harness2. Air conditioner control unit
4*3. Clips4. Evaporater case (upper)5. Air inlet sensor
6. Air therm0 sensor
7. Evaporater case (lower)
8. Evaporater assembly9. Grommet
IO. Insulator11. Rubber insulator
12. Clip+) ++ 13. Expansion valve14. O-ringNOTE
(1) Reverse the disassembly procedures to reassyyble(2) ~~ : Refer to “Service Points of Disassembly,(3) +4 : Refer to“Service Points of Reassembly
(4) m : Non-reusable parts.
.

.^
EMISSION CONTROL
SYSTEMS
CONTENTSN25AA-
CATALYTICCONVERTER...............................20CRANKCASE EMISSION CONTROL
SYSTEM...........................................................7Components Location
...................................7Crankcase Ventilation System
Inspection......................................................8Positive Crankcase Ventilation Valve
...........8EVAPORATIVE EMISSION CONTROL
SYSTEM...........................................................9
AirConditionerSwitch.................................14Air Flow Sensor, Engine Coolant
Temperature Sensor and Intake Air
Temperature Sensor
.....................................14
Canister.........................................................14Components Location
...................................9
FuelFillerCapInspection............................14Overfill Limiter (Two-way Valve)
..................14
PurgeControlSolenoidValve......................13Purge Control
SystemInspection................11
PurgeControlValve.....................13EXHAUST GAS RECIRCULATION (EGR)
SYSTEM...........................................................15Air-fuel Ratio Control (MPI) System
............20Components Location
...................................15EGR Control Solenoid Valve

.................................................19
EGR
SystemInspection...............................17EGR Temperature Sensor
......19
EGR Valve.....................................................18
Therm0 Valve 2.0L DOHC Engine>...................................18
SPECIFICATIONS.............................................2General Specifications
..................................2
Sealant..........................................................2Service Specifications
...................................2
TorqueSpecifications...................................2
TROUBLESHOOTING......................................3
VACUUMHOSES...........................................4
VacuumHosesRouting...............................4

25-14EMISSION CONTROL SYSTEMS- Evaporative Emission Control System
(5) Measure the resistance between the terminals of the
solenoid valve.
Standard value: 36-44
Q [at 20°C (68OF)]_
6EM137
AIR FLOW SENSOR, ENGINE COOLANT TEMPER-
ATURE SENSOR AND INTAKE AIR TEMPERA-
TURE SENSORTo inspect these parts, refer to GROUP
14-MPI System
Components.‘.
AIR CONDITIONER SWITCHTo inspect the air conditioner switch, refer to GROUP
24’--AirConditioner Switch.
OVERFILL LIMITER (TWO-WAY VALVE)N2BlBE&To inspect the overfill limiter (two-way valve), refer to GROUP
14-Fuel Tank.
CANISTERNzslBmTo inspect the canister, refer to GROUP
14-Fuel Line and
Vapor Line.
FUEL FILLER CAP INSPECTIONNZSIBJACheck the gasket of the fuel filler cap, and, the filler cap itself,
for damage or deformation; replace the cap if necessary.