Mitsubishi Eclipse Workshop Manual page 720

55-20
HEATER, ArR
coNDrnoNER
AND vENTrtATroN
-
F*"*Euüm6nr
COMPRESSOR NOISE
When.. investigating an air
conditioning related noise,
youl
must first
know the conditions when the noise occurs. These
conditions are: weather, vehicle speed,
in gear
on
neutral,
engine temperature
or any other
special conditions.
Noises
that
develop during air
conditioning 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
asiembly.
Verify accessory drive belt tension (power steering or alterna-
tor).
lmproper accessory drive belt tension can cause a misleading
noise when the compressor is engaged and little or no noisä
yvhen
the
compressor
is
disengaged.
Drive.belts are speed sensitive- That is,
at
different
engine
speeds, and depending upon belt tension, belts can devälop
unusual noises
that
are often
mistaken
for
mechanicäl
problems
within the
compressor.
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 ambieirt conäitions
(hagh
heao pressure),
restrict air flow
through condenser. Inställ manifbto gauge
set to make sure discharge pressure doesn,t
exceedi.0T0
. .
lPg
120.7
kg/cm2,300
psi).
(2) Tighten all compressor. mounting bolts, clutch mounting
bolt, and compressor drive belt. check to assure clutch
coä
is tight (no
rotation or
wobble).
(3) check
refrigerant hoses for rubbing or interference that
can
cause unusual
noises.
lJf lne.ct
refrigerant charge (See
,,Charging
the
System.).
(5)
Recheck compressor noise
as in
Ste-p
i.
(6) lf
noise still exists,-loosen compressor mounting bolts
and
retorque. Repeat Step
1.
(7) lf
noise continues, replace compressor and repeat
step
1.
FOWER RELAY
CHEGK
NOTE
For information conceming
the
installation position of
each
relay, refer
to
P.55€.
OONDENSER
FAN
MOTOR REIAY,
MAGNET
CIUTCTI
REIAY,
BTOWER MOTOR HIGH
REIAY, XCITEC
NErNV
check for continuity between the terminals when the battery
powerfu.pply
is
applied
to
terminal (2), and terminal
(41 is
grounded.
When
curent
flows
Between terminals
l-3
Continuity
When no
cunent
flows
Between terminals 1-3
No
continuity
Between terminals
2-4
Continuity
Condenser
fan motor
relay.
Magnet
clutch
relay,
Blower
motor
High
relay
Heater
relay
-,G'
4 ./t
ffi-:':6
z-
-.N
V
r6LGt0l
L.
.J
@
M'rtsublshi Motors
Corporetion
Apr.
1991
PWUE9o!0