2004 MITSUBISHI ENDEAVOR air conditioning

handling R-134a.
R-134a evaporates so rapidly at normal atmospheric pressures and temperatures that
it tends to freeze anything it contacts. For this reason, extreme care must be taken to
prevent any liquid refrigerant from contacting the skin and especially the eyes.
Always wear safety goggles when servicing the refrigeration part of the A/C
system. Keep a bottle of sterile mineral oil handy when working on the refrigeration
system.
1. Should any liquid refrigerant get into your eyes, use a few drops of mineral oil
to wash them out.
R-134a is rapidly absorbed by the oil.
2. Next splash your eyes with plenty of cold water.
3. Call your doctor immediately even if irritation has ceased.
In most instances, moderate heat is required to bring the pressure of the refrigerant
in its container above the pressure of the system when charging or adding
refrigerant.
A bucket or large pan of hot water not over 40°C (104.0°F) is all the heat required
for this purpose. Do not heat the refrigerant container with a blow torch or any other
means that would raise temperature and pressure above this temperature. Do not
weld or steam-clean on or near the system components or refrigerant lines.
WARNING:Do not heat R-134a above 40 °C (104.0 °F) or it may
catch fire and explode.
CAUTION: Keep R-134a containers upright when charging the
system.
WARNING:The leak detector for R-134a should be used to
check for refrigerant gas leaks.
CAUTION: Do not allow liquid refrigerant to touch bright metal

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

When metering R-134a into the refrigeration system, keep the supply tank or cans
in an upright position. If the refrigerant container is on its side or upside down,
liquid refrigerant will enter the system and damage the compressor.
Refrigerant will tarnish bright metal and chrome surfaces, and in combination with
moisture can severely corrode all metal surfaces. OPERATION CONDENSER FAN AND RADIATOR FAN CONTROL
For the operation of each fan, refer to
SYMPTOM PROCEDURES
.
COMPRESSOR CONTROL WHEN OPERATING THE AIR CONDITIONING SWITCH
The air thermo sensor, which senses the temperature of the air flowing out of
the evaporator, deactivates the compressor at 3°C (37.4°F) or below. The dual pressure switch turns OFF when the refrigerant pressure becomes
excessively high or low, thus protecting the compressor circuit. When the air thermo sensor is activated, and the ignition switch, blower switch,
and air conditioning switch are ON, the A/C compressor clutch relay is
energized.
WHEN OPERATING THE MODE SELECTION DIAL
The air conditioning will work when the mode selection dial is set to the
"Defroster" or "Defroster/foot" position or the temperature control dial is set to
the "MAX A/C" position. In other dial positions, when the air conditioning
switch is turned on, the air conditioning will work.
A/C COMPRESSOR CLUTCH RELAY ON CONDITION
or it will be stained.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 1: Identifying A/C Compressor Clutch Relay ON Condition

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

AUTO A/C DIAGNOSIS INTRODUCTION After air is taken in through the damper, it is fed to the evaporator by the blower fan
and motor and cooled. The air cooled by the air mix damper is mixed appropriately
with the warmed air to achieve a comfortable temperature. If the A/C does not
operate or the cooled air is not discharged, the system components or relay may be
faulty. AUTOMATIC AIR CONDITIONING TROUBLESHOOTING STRATEGY Use these steps to plan your diagnostic strategy. If you follow them carefully, you
will be sure that you have exhausted most of the possible ways to find a heater, air
conditioning and ventilation fault.
1. Gather information from the customer.
2. Verify that the condition described by the customer exists.
3. Find the malfunction by following
SYMPTOM CHART
.
4. Verify malfunction is eliminated.
DIAGNOSTIC FUNCTION HOW TO CONNECT THE SCAN TOOL (MUT-III)
2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Required Special Tool
:
MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
1. Ensure that the ignition switch is at the "LOCK" (OFF) position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 and the personal
computer.
4. Connect special tool MB991910 to special tool MB991824
5. Connect s
pecial tool MB991910 to the data link connector.
CAUTION: To prevent damage to scan tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting scan tool
MB991958.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 2: Connecting Special Tool MB991910 To Data Link Connector

Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

6. Turn the power switch of special tool MB991824 to the "ON" position.
7. Start the MUT-III system on the personal computer. HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES Required Special Tool:

MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "S
ystem Select."
NOTE: When the special tool MB991824 is energized, the
special tool MB991824 indicator light will be illuminated
in a green color.
NOTE: Disconnecting the scan tool is the reverse of the
connecting sequence, making sure that the ignition switch
is at the "LOCK" (OFF) position.
CAUTION: To prevent damage to scan tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting scan tool
MB991958.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does
not display.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

5. Choose "Air Conditioner" from the "BODY" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code."
8. If a DTC is set, it is shown.
9. Choose "Erase DTC" to erase the DTC.
2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor