1991 MITSUBISHI 3000GT oil

HEATERS AND MANUAL AIR CONDITIONER - Compressor
Spring
Valve
ompressor
2OPO286~
SERVICE POINT OF DISASSEMBLYMSlSFAE3. REMOVAL OF NUT
Use the special tool to loosen the nut,
INSPECTIONM55SGABl Check the surface of the armature for scoring or bluing.
l Check the surface of the rotor for scoring or bluing.
l Check the sealing surfaces for cracks, scratches and
deformation.
0Check the front housing for cracks or scoring on the sealing
surfaces.l Check the compressor shaft for scoring.
J
HIGH PRESSURE RELIEF VALVE CHECK
The high pressure relief valve is a safety feature which releasesI
part of the refrigerant inside the system into the atmospherewhen the high pressure level exceeds 3,550
kPa (505 psi)
during air conditioner operation.Once the pressure inside the system has been reduced to
2,400
kPa (341 psi) or lower, the high pressure relief valveL&Jcloses, thus allowing continued operation.
(1) If a leak is detected at section A, replace the high pressure
relief valve. The valve can be used unless there is a leak(from that section.
(2) If a leak is detected at section B, retighten the valve. If the
leak still persists after retightening the valve, replace the
packing.
THERMOSTAT CHECK
(1) Dip the thermostat in engine oil.
(2) Check for continuity across terminals @ and @ when theengine oil is heated.
Standard value:Continuity at approx.
110°C (230°F) or less
at A pointNo continuity at approx. 155°C (311°F) or more
,I
at B pointII;TSB Revision

HEATERS AND MANUAL AIR CONDITIONER - Compressor55-3120N003d
2OFOO96
I
Ec-3
3180?+I! (25)zz
h34\
*
Engine speed rpm2OPO2S
\CrankshaftTapered part
20A0157
REVOLUTION PICK UP SENSOR CHECKMeasure the resistance between terminals
@ and @ of the
connector.
Normal resistance: 405 + 35 R when ambient temperatureis
20°C (68°F)
If the measurement deviates greatly from the above resis-
tance, replace the revolution pick up sensor assembly.
CONTROL VALVE CHECKThe control valve detects a low pressure level during the
operation of the air conditioner, and adjusts the amount of
refrigerant to be bypassed.
(1) Operate the air conditioner under a high temperature loadcondition (when vehicle interior temperature is high).
(2) Connect a low pressure gauge to the air compressor.
(3) Operate the air conditioner with the engine running at idle.
(4) Gradually increase the engine speed while observing the
low pressure gauge.
If the valve is normal, the low pressure drops slowly as the
engine speed increases until a pressure of 180
kPa (25 psi)
is reached, at which point the pressure temporarily ceasesto drop. Then, the pressure again starts dropping as the
engine speed further increases.If the valve is abnormal, the low pressure drops in direct
proportion to the increase in engine speed without a
temporary leveling off at the 180 kPa (25 psi) pressure level.
If the low pressure drops like this, replace the control valve.
SERVICE POINTS OF REASSEMBLYM556HAF
8. INSTALLATION OF CLUTCH COIL
Align the pin of the clutch coil with the pin hole in the fronthousing, and then fit it into the hole.
7. INSTALLATION OF SNAP RING
Install the snap ring so that the tapered surface is at the
outer side.
1 TSB Revision

HEATERS AND MANUAL AIR CONDITIONER - ::“dE:; and Condenser55-33
CONDENSER AND CONDENSER FAN MOTOR
MFSTA-A
idREMOVAL AND
IlilSTALLATlONPre-removal and Post-installation
l Discharge and Charging of the Refrigerant
l Removal and lnsiallation of the Alternator(Refey to GROUP 16 -Alternator.)
6
f: Piplng connection
@
20N00890-ring
d-ringCompressor oil: Freol S-83 or Suniso 5GS
9-11 Nm
7.0 - 8.0 ftlbs.
9’23’Nm17 ft.lbs.
asset-rRemoval steps1. Condenser fan motor
2. Fan
3. Motor assembly
4. Shroud
w w 5. Radiator fan motor assembly(Refer to GROUP 14- Radiator.)
Insulator installationbolts
6.4*7. Liquid pipe A and liquid pipe Bl *8. Condenser9.Bushings
/9.0 7.0ft.lbs. Nm2OFOO28
SERVICE POINTS OF REMOVALM!XTEtAC7. REMOVAL OF LIQUID
‘PIPE A AND LIQUID HOSE B
(1) Loosen the flare nut by using two wrenches.
(2) Plug the disconnected hose and pipes and the openingsof the condenser in order to prevent dust, dirt and other
foreign material from entering.
TSB Revision

HEATERS AND MANUAL AIR CONDITIONER - Rdrigerant Line55-35
REFRIGERANT LINE
/’REMOVAL AND INSTALLATION
L;Pre-removal and Post-installation Operation
l Discharge and Charging of Refrigerant(Refer to P.55-14, 11.)
Removal steps
a*1. High-pressure hosel *2. High-pressure pipe
3. Liquid pipe A
4. Liquid pipe B
5. Low-pressure hose B
6. Low-pressure hose A
7. Receiver bracket
8. Receiver
9. Dual-pressure switch23 Nm
17 ft.lbs.-\-M55UA-
-
1: Piping connection
O-ring20N0089
1
O-ringCompressor oil: Freol S-83 or Suniso 5GS
13 Nm
9.0
ft.lbs.
9.0-11 Nm7.0 -8.0 ft.lbs.
\
TE NUTII” 1.1119.0 ft.lbs.
7.0 - 8.0 ft.lbs.
/
‘Ill
q9
8
2OFOO68
SERVICE POINTS OF REMOVALMIBUBAC
1. REMOVAL OF HIGH-PRESSURE HOSE
/ 2. HIGH-
PRESSURE PIPELoosen the flare nut ,by using two wrenches.
INSPECTIONMHUCAD
CHECKING DUAL PRESSURE SWITCHFor information concerning the checking procedures of the dual
pressure switch, refer to “Service Adjustment Procedures” on
P.55-10.
1 TSB Revision

Pre-removal and Post-installation Operationl Draining and Refilling of Engine Coolant(Refer to GROUP 00 - Maintenance Service.)
1. Engine coolant temperature switchHEATERS AND MANUAL AIR CONDITIONER
- Z!&E%Ltch55-39
ENGINE COOLANT TEMPERATURE SWITCH
M55xA- -
L
REMOVAL AND INSTALLATIONSealant: 3M Nut Locking Part No.
4171 or equivalent
BQQQQQ20A0199INSPECTION
MSSXCAAENGINE COOLANT TEMPERATURE SWITCH
(ALWAYS-
CLOSED TYPE CHECK)
(1) Immerse the engine coolant temperature switch in oil and
heat by a gas stove or similar method so as to increase the
oil temperature.(2) Check to be sure that the engine coolant temperature
switch is switched OFF when the oil temperature reaches
the standard value.Standard value: 112
- 118°C (233 - 244°F)
CautionUse engine oil for this test; stir it well while heating,
and do not heat more than necessary.
1 TSB Revision