Mitsubishi 3000GT Service Manual page 1249

HEATERS AND MANUAL
Blower motor HI relay <Up to 1995 models> ZXIFOO~~
AIR CONDITIONING
ADJUSTMENT PROCEDURES
(1) Select a quiet area for testing. Duplicate conditions as
much as possible. Switch compressor on and off several
times to clearly identify compressor noise.
To duplicate high ambient conditions (high head pressure),
restrict air flow through condenser. Install manifold gauge
set to make sure discharge pressure doesn't exceed 2,070
(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. (See "Charging System".)
(5) Recheck compressor noise as in Step 1.
(6) If noise still exists, loosen compressor mounting bolts
and retorque. Repeat Step 1.
(7) If noise continues, replace compressor and repeat Step
1.
POWER RELAY CHECK
(1) Remove the radiator fan motor relays (HI) and (LO) from
the relay box on the right of the engine compartment.
(2) Remove the radiator fan motor relay (air conditioning)
and (LO), and air-conditioning compressor relay from the
relay box on the left of the engine compartment.
(3) Remove the blower motor relay from the junction box.
(4) Remove the blower motor HI relay cup to 1995 models>
from the blower case assembly.
(5) Check the continuity between terminals using a circuit
tester.
IDLE-UP OPERATION CHECK
(1) Before inspection and adjustment set vehicle in the follow-
ing condition:
l
l
l
Steering wheel: Straightforward
l
(2) Check to be sure that the idling speed becomes the stan-
dard value when the air conditioning switch is switched
ON and the air conditioning is activated.
Standard value: 900 + 100 rpm
NOTE
Idle speed is controlled by the ISC system and is not
adjustable. If, idle speed is not within specifications, check
the ISC system.
(Refer to GROUP 13A - On-vehicle Service.)
TSB Revision
Engine coolant temperature: 80-95°C (176-203°F)
Lights, electric cooling fan and accessories: Set to
OFF
Transaxle: Neutral (N or P for vehicles with A/T)