Page 2369 of 3870
Fig. 275: Inserting Thermometer In Center Air Outlet
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
10. Note the discharge air temperature.
PERFORMANCE TEMPERATURE CHART
NOTE: If the A/C clutch cycles, take the reading before the
clutch disengages.
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Fig. 276: Performance Temperature Char
t
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
REFRIGERANT LEAK REPAIR PROCEDURE LOST CHARGE If the system has lost all charge due to a leak:
1. Evacuate the system. (Refer to
CHARGING
and
DISCHARGING
).
2. Charge the system with approximately 0.453 kg (1 pound) of refrigerant.
3. Check for leaks.
4. Discharge the system.
5. Repair leaks.
6. Replace receiver drier.
7. Evacuate and charge system.
LOW CHARGE If the system has not lost all of its refrigerant charge; locate and repair all leaks. If it
is necessary to increase the system pressure to find the leak (because of an
especially low charge) add refrigerant. If it is possible to repair the leak without
discharging the refrigerant system, use the procedure for correcting low refrigerant
level. COMPRESSOR NOISE CHECK You must first know the conditions when the noise occurs. These conditions are:
CAUTION: Replacement filter-drier units must be sealed
while in storage. The drier used in these units
will saturate water quickly upon exposure to the
atmosphere. When installing a drier, have all
tools and supplies ready for quick assembly to
avoid keeping the system open any longer than
necessary.
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weather, vehicle speed, in gear or neutral, engine temperature or any other special
conditions. Noises that develop during A/C operation can often be misleading. For example:
what sounds like a failed front bearing or connecting rod, may be caused by loose
bolts, nuts, mounting brackets, or a loose clutch assembly. Verify accessory drive
belt tension (power steering or generator).
Improper accessory drive belt tension can cause a misleading noise when the
compressor is engaged and little or no noise when the compressor is disengaged.
Drive belts are speed-sensitive. That is, at different engine speeds, and depending
upon belt tension, belts can develop unusual noises that are often mistaken for
mechanical problems within the compressor. HANDLING TUBING AND FITTINGS Kinks in the refrigerant tubing or sharp bends in the refrigerant hose lines will
greatly reduce the capacity of the entire system. High pressures are produced in the
system when it is operating. Extreme care must be exercised to make sure that all
connections are pressure tight. Dirt and moisture can enter the system when it is
opened for repair or replacement of lines or components. The following precautions
must be observed. The system must be completely discharged before opening any
fitting of connection in the refrigeration system. Open fittings with caution even
after the system has been discharged. If any pressure is noticed as a fitting is
loosened, allow trapped pressure to bleed off very slowly. Never attempt to rebend formed lines to fit. Use the correct line for the installation
you are servicing. A good rule for the flexible hose lines is keep the radius of all
bends at least 10 times the diameter of the hose.
Sharper bends will reduce the flow of refrigerant. The flexible hose lines should be
routed so that they are at least 80 mm (3.1 inches) from the exhaust manifold. It is
good practice to inspect all flexible hose lines at least once a year to make sure they
are in good condition and properly routed.
On standard
plumbin
g fittin
gs with O-rin
gs, these O-rin
gs are not reusable.
2004 Mitsubishi Endeavor LS
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ADJUSTMENT 1. Select a quiet area for testing. Duplicate conditions as much as possible.
Switch the compressor on and off several times to clearly identify compressor
noise. To duplicate high ambient conditions (high head pressure), restrict air
flow through the condenser. Install a manifold gauge set to make sure
discharge pressure doesn't exceed 2,070 kPa (300.2 psi).
2. Tighten all compressor mounting bolts, clutch mounting bolt, and compressor
drive belt. Check to assure clutch coil is tight (no rotation or wobble).
3. Check refrigerant hoses for rubbing or interference that can cause unusual
noises.
4. Check refrigerant charge. (Refer to
CHARGING
and
DISCHARGING
).
5. Recheck compressor noise as in Step 1 .
6. If noise still exists, loosen compressor mounting bolts and retighten. Repeat
Step 1 .
7. If noise continues, replace compressor and repeat from Step 1 .
POWER RELAY CHECK FRONT BLOWER RELAY CONTINUITY CHECK
2004 Mitsubishi Endeavor LS
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Page 2373 of 3870
Fig. 277: Identifying Front Blower Relay
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
FRONT BLOWER RELAY CONTINUITY CHART
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A/C COMPRESSOR CLUTCH RELAY CONTINUITY CHECK BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
4 - 5
Open circuit
Connect terminal 1 to the
positive battery terminal
Connect terminal 3 to the
negative battery terminal
4 - 5
Less than 2 ohms
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Fig. 278: Identifying A/C Compressor Clutch Relay
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
A/C COMPRESSOR CLUTCH RELAY CONTINUITY CHART
FAN CONTROL RELAY CONTINUITY CHECK BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
1 - 4
Open circuit
Connect terminal 2 to the
positive battery terminal
Connect terminal 3 to the
negative battery terminal
1 - 4
Less than 2 ohms
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor