1987 MITSUBISHI MONTERO Valve

HEATERS - Service Adjustment Procedures 24-7
TEMPERATURE CONTROL LEVER
1. Move the temperature control lever from its extreme left
position to its extreme right position and check to be sure
that it moves correctly and smoothly to each position.
2. Then move the temperature control lever to the extreme
left position, and check to be sure that warm air does not
come out when the blower is operated.
3. If the air flow is not correct in the above step, adjust the
temperature control wire.
h?* I Water valve lever
-
7 Blend air d Adjustment of the Blend Air Damper
I. Move the warm water flow control lever to the extreme left
position.
2. Disconnect the water valve control wire from the blend air
damper lever and the heater unit’s clip.
3. Remove the water valve cover.
4. Unfasten the clip of the blend air damper lever, and
disconnect the link for water valve lever from the blend air
damper lever.
5. Push the water valve lever all the way inward so that the
water valve is at the closed position.
6. Turn the blend air damper lever all the way in the direction
of the arrow so that the blend air damper is completely
closed at the lower most position.
7. Attach the end of the link for the water valve lever to the
blend air damper lever.
8. Install the water valve cover.
9. After connecting the water valve control wire to the blend
air damper lever, connect to the clip part of the heater unit. Caution
Be careful that the lever does not move when clipping.
10. Check to be sure that the temperature control lever
operates smoothly at each position. Also check to be sure
that the blend air damper is completely closed when the
temperature control lever is moved to the extreme left
position and the extreme right position. 1 STB Revision

24-8 HEATERS - Service Adjustment Procedures
ater valve cover
2OW751
WAiER VALVE REPLACEMENT N24FBAC
I. Set the temperature control lever to the extreme right
position.
2. Remove the radiator drain plug, and then drain the engine
coolant.
3. Remove the air filter
4. Remove the heater hose clamp to disconnect the heater
hose.
5. Disconnect the water valve control wire from the blend air
damper lever and the heater unit’s clip.
6. Remove the water valve cover.
7. Remove the piping clamp.
8. Unfasten the clip of blend air damper lever, and disconnect
the link for the water valve lever from the blend air damper
lever.
9. Remove the joint hose clamp.
10. Cut the joint hose.
11. Remove the water valve from the heater core.
12. Apply a coating of soapy water to the inside surface of the
new joint hoses, and then connect them to the pipe part of
the water valve and the heater core.
13. Connect the link, and then install the heater cover.
1 STB Revision

HEATERS - Heater Control 24-9
HEATER CONTROL
N24GA-
REMOVAL AND INSTALLATION
2QW824
Removal steps
4+ 1. Glove box stoppers
++ ~~ 2. Air selection control wire
3. Knobs
4. Plugs
5. Center panel
6. Connection of center panel wiring har-
ness to front wiring harness connector
7. Lap heater duct (B)
8. Defroster duct
++
l + 9. Mode selection control wire
++
l + 10. Water valve control wire
l a II. Heater control assembly
12. Blower switch EyTEeverse the removal procedures to reinstall.
(2) 4+ : Refer to “Service Points of Removal”.
(3) eq : Refer to “Service Points of Installation”.
SERVICE POINTS OF REMOVAL N24GBAE
1. REMOVAL OF GLOVE BOX STOPPERS (1) Open the glove box lid.
(2) Remove the glove box stopper. (3) Pull the glove box outward.

24-10 HEATERS I- Heater Control
2ow7a7
VIOVAL OF AIR SELECTION CONTROL WIRE
Use a screwdriver to pry and remove the clip that holds
the outer cable of the air selection control wire.
Disconnect the inner cable of the air selection control
wire from the end of the recirculation/fresh-air change-
over damper lever.
9. REMOVAL OF MODE SELECTION CONTROL WIRE
(1) While using a screwdriver to pry the clip that holds the
outer cable of the mode selection control wire, pull the
/ outer cable to remove it from the clip.
(2) Disconnect the inner cable of the mode selection
control wire from the end of the mode selection
damper lever.
10. REMOVAL OF WATER VALVE CONTROL WIRE
(1) Use a screwdriver to pry and remove the clip that holds
the outer cable of the water valve control wire.
(2) Disconnect the inner cable of the water valve control
wire from the end of the water valve control lever.
INSPECTION
BLOWER SWITCH N24GCAC
Operate the switch, and check the continuity between the ter-
minals.
Switch position
OFF
. Terminal
214567
o--O
0
0
0 0
NOTE
O-O indicates that there is continuity between the terminals.
/ STB Revision
-7

HEATERS - Heater Control 24-11
Top view
Bottom view
I
2OW553
2OW534
2OW750
SERVICE POINTS OF INSTALLATION N24GDAD
11. APPLICATION OF GREASE TO HEATER CONTROL AS-
SEMBLY Apply the chassis grease to all the moving parts of the
heater control assembly.
10. lNSTALLATlON OF WATER VALVE CONTROL WIRE Connect the water valve control wire to the water valve
control lever by following the steps below.
(1) Move the temperature control lever to the extreme left
position
(2) With the water-valve control lever pressed inward in
the direction indicated by the arrow, connect the inner
cable of the water-valve control wire to the end of the
water-valve control lever, and then secure the outer
cable by using a clip.
9. INSTALLATION OF MODE SELECTION CONTROL WIRE Connect the mode selection control wire to the mode
selection damper lever by following the steps below.
(1) Move the mode selection lever to the %E position.
(2) With the mode selection damper lever pressed inward
in the direction indicatecl by the arrow, connect the
inner cable of the mode selection control wire to the
end of the mode selection lever, and then secure the
outer cable by using a clip.
2. INSTALLATION OF AIR SELECTION CONTROL WIRE Connect the air selection control wire to the air selection
damper lever by following the steps below.
(1) Move the air selection control lever to the& position.
(2) With the air selection damper lever pressed inward in
the direction indicated by the arrow, connect the inner
cable of the air selection control wire to the end of the
air selection lever, and then secure the outer cable by
using a clip.
1 STB Revision

HEATERS - Heater Unit 24-13
2. REMOVAL OF INSTRUMENT PANEL
Refer to GROUP 23 BODY-Instrument Panel.
INSPEGTION N24cAa
l
Check the damper and link mechanism for operation.
l Check the heater core for clogging or water leakage.
l Check the water valve for operation and clogging.
EATER CORE REPLACEMENT
I. Remove the water valve cover.
2. Remove the following parts to remove the water valve.
(1) Piping clamp
(2) Water valve link
(3) Joint hose clamp
(4) Joint hose
(5) Screw
3. Remove the FOOT/DEF damper link from the mode
selection damper lever.
4. Move the damper lever to the position at which the mode
selection damper lever does not protrude very much to the
heater core side.
5. Remove the heater core. If at this time the damper lever
and heater core are in contact, making removal difficult,
remove the damper lever.
Caution
To prevent interference between the heater
core and
case, use care not to peel the heater
core felt away
when the heater core is removed.
6. After installing the heater core and water valve, install the
link for each damper after referring to the “Service
adjustment procedures” section.
SERWOCE POINTS OF INSTALLATION
2. INSTALLATION OF INSTRUMENT PANEL
Refer to GROUP 23 BODY-Instrument Panel.
N241EAD
1 STB Revision

24-20 AIR-CONDITION!NG-General Information
I
AIR-CONDITIONING SYSTEM COMPO
N24BBBB
Condenser MDuct, joint (Blower side)
oint (Heater unit
Condenser
2OWB31
Suction Pipe Receiver bracket side)
COMPRESSOR - The prime purpose of the compressor is to compress the low pressure refrigerant vapor
from the evaporator into a high pressure, high temperature vapor. The 6 cylinder 6P148 compressor is used.
MAGNETIC CLUTCH is mounted on the compressor providing a convenient way to drive and disengage
compressor in accordance to the cooling needs. CONDENSER is located in front of the radiator. Its function
is to cool the hot, high pressure refrigerant gas causing it to condense into high pressure liquid refrigerant.
RECEIVER DRIER is used to remove any traces of moisture from the refrigerant system. This component
incorporates the sight glass and fusible plug. SIGHT GLASS at the top of the receiver drier is provided as a
diagnostic tool to observe refrigerant flow and observe refrigerant level. THE FUSIBLE PLUG is located on
the receiver drier. Its function is to prevent damage to the air conditioning system in the event that
excessive pressure develops due to condenser air flow being restricted by, for example, leaves, newspaper,
an overcharge of refrigerant, or air in the system. LOW PRESSURE SWITCH prevents damage to the
compressor in case of system loss of refrigerant charge. EXPANSION VALVE - The expansion valve is used
for all applications. Its function is to meter refrigerant into the evaporator in accordance with cooling
requirements. EVAPORATOR COIL is located in the unit and its function is to cool and dehumidify the air
before it enters the vehicle. FREEZE UP CONTROL FIN THERMOSTAT SENSOR is installed at the heater
side of evaporator. The main function of a freeze control is to keep condensate water on the face of the
evaporator coil from freezing and restricting air flow. WATER TEMPERATURE SWITCH - When the
temperature of the radiator coolant became high, this switch functions to stop the compressor and prevent
engine overheating. SERVICE VALVE at the compressor and the discharge line. The valves are used to test
and service the refrigerant system. REFRIGERANT R-12 is used maximum amount 907 g (32 oz.) R-12.
COMPRESSOR OIL is used DENS0 oil 6 maximum amount 110 cc (3.7 U.S.fl.oz., 3.9 Imp.fl.oz.).
/ STB Revision

AIR-CONDITIONING-Troubleshooting 24-23
1 CONTINUED FROM PREVIOUS PAGE] i
--) 2lnsufficient refrigerant
?
--) 3.Receiver drier clogged o Check the refrigerant amount _1 Supply
(P.24-29) refrigerant
. Check the receiver drier
.--+ Replace
(P.24-29)
--. 4.Abnormal rotation of Drive belt loose
compresspor
* (P.24-40) __) Adjust the
belt
1
- 5.Expansion valve clogged ) Check the expansion valve - Replace
(P.24-44) t
- 6.Poor compression of
compressor c Check the compressor
(P.24-32)) - Replace
1 STB Revision