Mitsubishi Montero (1991+). Manual - part 34

 specification  ..........  A  ..  Require repair or replacement.

Circuit shorted  .........  A  ..  Require repair or replacement.

Connector melted,

 affecting performance  ..  A  ...........  ( 1) Require repair or

                                                     replacement.

Connector melted, not

 affecting performance  ..  2  ...........  ( 1) Suggest repair or

                                                     replacement.

Connector missing  .......  C  ............  Require replacement.

Diode open  ..............  A  ..  Require repair or replacement.

Diode shorted  ...........  A  ..  Require repair or replacement.

Insulation damaged,

 conductors exposed  .....  A  ..  Require repair or replacement.

Insulation damaged,

 conductors not exposed  .  1  ............  Suggest replacement.

Protective shield

 (conduit) melted  .......  B  ........  (1) Require replacement.

Protective shield

 (conduit) missing  ......  C  ............  Require replacement.

Routed incorrectly  ......  B  .................  Require repair.

Secured incorrectly  .....  B  .................  Require repair.

Terminal broken  .........  A  ..  Require repair or replacement.

Terminal burned, affecting

 performance  ............  A  ...........  ( 1) Require repair or

                                                     replacement.

Terminal burned, not

 affecting performance  ..  2  ..  Suggest repair or replacement.

Terminal corroded,

 affecting performance  ..  A  ..  Require repair or replacement.

Terminal corroded, not

 affecting performance  ..  2  ..  Suggest repair or replacement.

Terminal loose, affecting

 performance  ............  B  ..  Require repair or replacement.

Terminal loose, not

 affecting performance  ..  1  ..  Suggest repair or replacement.

Voltage drop out of

 specification  ..........  A  ..  Require repair or replacement.

(1) - Determine cause and correct prior to repair or

      replacement of part.

A/C SYSTEM PRECAUTIONS 



1991 Mitsubishi Montero

         AIR CONDITIONING & HEAT

         A/C System Precautions

         * PLEASE READ THIS FIRST *

CAUTION: When discharging air conditioning system, use only approved

         refrigerant recovery/recycling equipment. Make every attempt

         to avoid discharging refrigerant into the atmosphere.

         BEFORE OPENING THE SYSTEM

         Before disconnecting any lines or fittings, the system must

be completely discharged using approved refrigerant recovery/recycling

equipment.

         DISCHARGING A/C SYSTEM

NOTE:    Recent findings by the EPA indicate that R-11, R-12 and R-113

         are harmful to the Earths’ protective Ozone layer. Make every

         attempt possible, to avoid discharging R-11, R-12 or R-113

         into the atmosphere.

         1) Remove service valve caps and install gauges. For high

side gauge hose, Adapter (D81L-19703-A) must be used to connect to

high side service valve.

         2) Place open end of center hose in garage exhaust outlet or

in a well ventilated area. Slightly open low side gauge valve and let

refrigerant escape slowly without loosing refrigerant oil.

         3) When system is nearly discharged, using approved

refrigerant recovery/recycling equipment, open high side gauge valve

to release any pressure trapped in compressor. Close valves

immediately after discharging to prevent entry of moisture.

         DISCONNECTING LINES & FITTINGS

         1) After system is discharged, using approved refrigerant

recovery/recycling equipment, carefully clean entire area around

coupling nut to prevent dirt entering system. Always use two wrenches

to avoid twisting or distorting lines and fittings (hold fitting with

one wrench while loosening coupling nut with second wrench).

         2) Cap or plug all LINES and FITTINGS immediately to prevent

entry of air and moisture into system. Do not remove these caps until

connections are being made.

         COMPONENT REPLACEMENT

         When components are replaced, system oil level must be

adjusted. Add refrigeration oil to replacement component. See

Compressor oil Check article, as well as, Component Oil Replacement

Quantities" chart under "A/C SYSTEM SPECS" article in this section.

         USING R-12 REFRIGERANT - SAFETY PRECAUTIONS

         1) Always work in a well-ventilated, clean area. Refrigerant

(R-12) is heavier than oxygen, and will displace oxygen in a confined

area. Always wear eye protection when working around air conditioning

systems and R-12. The system’s high pressure can cause severe injury

to eyes and skin if a hose were to burst. R-12 evaporates quickly

when exposed to atmosphere, freezing anything it contacts.

         2) Use care when handling refrigerant containers. DO NOT drop

or strike containers or expose refrigerant containers to excessive

heat. Containers must never be heated more than 125 F (52 C). Never

expose R-12 directly to open flame.

CAUTION: When R-12 is exposed to an open flame, drawn into a running

         engine, or detected with a Halide (propane) leak tester,

         poisonous phosgene gas is formed. Keep work areas ventilated

         and avoid running engines near work area.

         USING INDIVIDUAL R-12 CANS

         Disposable refrigerant cans (referred to as one pound cans)

have a flat type seal or a screw type seal, and proper can tap must be

used for each type. Be sure sealing gasket on can tap is in good

condition. A proper safety can tap will prevent refrigerant from

flowing back into open can, as tap has a one-way flow control.

NOTE:    Recent findings by the EPA indicate that refrigerant is

         harmful to the Earth’s protective Ozone layer. When

         discharging refrigerant avoid allowing refrigerant to enter

         the atmosphere. Refrigerant recovery system should be used

         when discharging the system.

         MULTI-CAN DISPENSING VALVES

         A multi-can dispensing valve allows attachment of several

cans of refrigerant, and is a good substitute when a bulk container is

not available. Cans are installed onto each leg of multi-can

dispensing valve in the same manner as the individual cans, and each

leg has its own can tap.

         CAN TAP INSTALLATION FLAT TYPE SEAL CANS

         On cam-lock or one-piece can taps, first turn the handle

outward to the fully open position. Securely engage locking lugs over

the can flange, and lock them in place by turning cam lock or locking

nut. Screw tap assembly into adapter so sealing gasket is fully seated

against the can top. Turn tap inward to pierce the can and close the

tap. DO NOT open tap until ready to purge the service hose or dispense

refrigerant into the system.

         On 2-piece can taps, be certain tap handle is turned fully

inward to the closed position. Check that locking base is turned to

its outer limit. Securely engage locking lugs over the can flange.

Turn entire tap assembly (without disturbing the closed setting)

downward into the locking base to pierce the can. DO NOT open tap

until ready to dispense into system.

         SCREW TYPE SEAL CANS

         Ensure can tap is fully closed. Screw refrigerant can into

can tap fitting until tight. This will pierce the can. Connect tap to

center hose on manifold gauge set. DO NOT open tap until ready to

dispense R-12 into system.

WARNING: DO NOT open high side hand valve while air conditioning

         system is in operation. This high pressure could rupture can

         or fitting at safety can valve, resulting in damage and

         personal injury.

         CONNECTING LINES & FITTINGS

         A new "O" ring should be used in all instances when

connecting lines and fittings (dip "O" ring in clean refrigeration oil

and make certain it is not twisted during installation). Always use

two wrenches to avoid twisting or distorting lines and fittings,

tighten coupling nuts securely.

         PLACING SYSTEM IN OPERATION

         After component replacement and/or system servicing has been

completed and all connections have been made, proceed as follows:

         1) Evacuate the system using a vacuum pump.

         2) Charge the system with new R-12 (refrigerant) according to

each individual vehicle as outlined in the

GENERAL COOLING SYSTEM SERVICING article. Also see Refrigerant

Capacity in this Section.

         3) Leak test the system, with particular attention to all new

connections and components.

         4) Make a performance test of the system. Never assume that a

recharging has automatically corrected a problem.

         COMPRESSOR REMOVAL INFORMATION - ISOLATION METHOD

         On systems which have compressors equipped with stem-type

service valves (Tecumseh), it is possible to isolate the compressor

for removal.

         Isolating

         Turn both high and low pressure manual valves to extreme

clockwise (front seat) position. Loosen cap on high pressure manual

valve connection to compressor and allow gas to escape until

compressor is relieved of pressure.

         COMPRESSOR REMOVAL INFORMATION - DISCHARGE METHOD

         This procedure is to be used on vehicles which have

compressor equipped with Schrader service valves. In these cases, the

compressor cannot be isolated and the system must be discharged, using

approved refrigerant recovery/recycling equipment, prior to compressor

removal.