air condition compressor MITSUBISHI ENDEAVOR 2004 Service Repair Manual

2004 HVAC
Heater Air Conditioning, Ventilation - Endeavor
GENERAL DESCRIPTION The heater and cooling units are combined in a single unit, which, with the mode
film damper and flow rate control valve in the heater unit, reduces ventilation
resistance, increases fan power, and decreases noise.
GENERAL SPECIFICATION SAFETY PRECAUTIONS Because R-134a refrigerant is a hydro fluorocarbon (HFC) which contains
hydrogen atoms in place of chlorine atoms, it will not cause damage to the ozone
layer.
Ozone filters out harmful radiation from the sun. To assist in protecting the ozone
layer, Mitsubishi Motors Corporation recommends an R-134a refrigerant recycling
device.
Refrigerant R-134a is transparent and colorless in both the liquid and vapor state.
Since it has a boiling point of -29.8°C (-21.64°F) at atmospheric pressure, it will be
a vapor at all normal temperatures and pressures. The vapor is heavier than air, non-
flammable, and non-explosive. The following precautions must be observed when
handlin
g R-134a.
ITEM
SPECIFICATION
Heater control assembly
Dial type
Compressor
MSC105CA
Compressor Model
Scroll type
Refrigerant and quantity g
(oz)
R-134a (HFC-134a), Approximately 560 - 600
(19.75 - 21.16)
WARNING:Wear safety goggles and gloves when servicing the
refrigeration system to prevent severe damage to
eyes and hands.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor


2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - 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 CHART
.
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 CONDITIONS
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 1: A/C Compressor Clutch Relay On Conditioning Chart

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

SERVICE PRECAUTIONS CAUTION LABELS The refrigerant gas warning label must be affixed in the location shown in the
figure on the left. Follow the instructions on the label when servicin
g.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 114: Heater And A/C System Symptom Chart

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

SYMPTOM PROCEDURES INSPECTION PROCEDURE 1: WHEN THE IGNITION SWITCH IS "ON", THE A/C DOES NOT OPERATE TECHNICAL DESCRIPTION (COMMENT) The blower system or the compressor system may be defective if there is no cool air
coming from the vents. TROUBLESHOOTING HINTS
Malfunction of blower motor Malfunction of A/C compressor
DIAGNOSIS Check that the blower motor operation when the blower switch is moved to the
"HI" position.


2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 129: View Of A/C Compressor Sensor Circuit

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

relay system may be defective. TROUBLESHOOTING HINTS
Improper amount of refrigerant Malfunction of the air thermo sensor Malfunction of the ambient air temperature sensor Malfunction of the A/C pressure sensor Malfunction of the A/C compressor clutch relay Malfunction of the A/C refrigerant temperature switch Malfunction of the air conditioning compressor clutch Malfunction of the A/C-ECU Malfunction of the PCM Damaged harness wires or connectors
DIAGNOSIS REQUIRED SPECIAL TOOLS:

MB991223: Test Harness Set 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)
STEP 1. Check the defogger and outside/inside air selection damper
control motor operation.

Q: Do the defogger and outside/inside air selection damper control motor
work normally?

YES:
Go to Step 2.
NO:
Refer to
INSPECTION PROCEDURE 10 MALFUNCTION OF
THE A/C
-ECU POWER SUPPLY SYSTEM
.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

STEP 2. Check the blower motor operation.

Q: Does the blower motor work normally?

YES:
Go to Step 3.
NO:
Refer to
INSPECTION PROCEDURE 5 BLOWER FAN AND
MOTOR DO NOT TURN
.
STEP 3. Check the A/C compressor.

Check the A/C compressor for compressor oil leaks.
Q: Is the check result satisfactory?

YES:
Go to Step 4.
NO:
Replace the A/C compressor or the expansion valve.
STEP 4. Using scan tool MB991958, read the diagnostic trouble code.

Check if an A/C-ECU DTC is set.
1. Connect scan tool MB991958 to the data link connec
tor.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

2. Turn the ignition switch to the "ON" position
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the check result satisfactory?

YES:
Go to Step 5.
NO:
Refer to
DIAGNOSTIC TROUBLE CODE CHART
.
STEP 5. Check A/C compressor clutch relay connector B-16X for loose,
corroded or damaged terminals, or terminals pushed back in the
connector.

Q: Is A/C compressor clutch relay connector B-16X in good condition?

YES:
Go to Step 6.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Check that the air conditioning works
normall
y.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 132: Locating Connector B
-16X

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 6. Check the A/C compressor clutch relay continuity.

Follow the table below to check the A/C compressor clutch relay for
continuit
y.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 133: Checking A/C Compressor Clutch Relay For Continuity

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig. 134: A/C Compressor Clutch Relay

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the A/C compressor clutch relay in good condition?

YES:
Go to Step 7.
NO:
Replace the A/C compressor clutch relay. Check that the air
conditioning works normally.
STEP 7. Check powertrain control module connector B-20 and A/C
compressor assembly B-114 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.

Q: Are powertrain control module connector B-20 and A/C compressor
assembly B-114 in good condition?

YES:
Go to Step 8.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Check that the air conditionin
g works

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor