Mitsubishi 3000GT 1994 Workshop Manual page 991

HEATER, AIR CONDITIONER
AND VENTILATION
-
serviceAdjustmentProcedu.""
55-33
(1)
(21
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
kPa
(21
.4kglcm',300 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. (See "Charging".)
(5)
Recheck compressor noise
as in Step
1.
(6) lf
noise still exists, loosen compressor mounting bolts and
retorque. Repeat
Step
1.
(7) lf
noise continues, replace compressor and
POWER RELAY CHECK
repeat Step
1.
Remove the radiator fan motor relays (Hl)and
(LOlfrom the
relay box
on the right of the engine
compartment.
Remove
the
radiator
fan motor
relay (air conditioner), con-
denser fan motor relays (Hl) and (LO), and magnetic clutch
relay
from the relay box on
the left of the engine compart-
ment.
Remove
the
blower motor relay from the junction
box.
Remove
the blower motor Hl
relay
from the blower
case
assembly.
Check
the continuity between terminals using
a
circuit
tester.
IDLE.UP OPERATION CHECK
Before
inspection
and adjustment
set
vehicle
in
the
following
condition:
.
Engine coolant
temperature: 80
- 95'C
(176 -
203"F1
.
Lights, electric cooling fan and accessories: Set
to
OFF
o
Transmission: Neutral
.
Steering
wheel:
Straightforward
Check
to
be sure that
the
idling speed becomes the
standard value when the air conditioner switch is switched
ON and
the air
conditioner
is
activated
Standard value: 900
+
100 rpm
NOTE
There is no necessity
to
make an adjustment, because the
idling speed is automatically adjusted by
the
ISC* system..
lf, hbwever, there occurs a deviation from
the
standard
value
for some reason, check
the
ISC* system.
ISC: ldle Speed
Control
(3)
(4)
(5)
(1)
(21
@
Mhsublghi
Motors
Corporatlon
May 1992
PWUEgl19