Mitsubishi Eclipse 1990 Service Manual page 2048

HEATER, AIR
55-8
AND VENTILATION
Engine (Non-turbo)>
Terminal No. Name of Signal
compressor clutch relay
2
Automatic compressor-ECM ground
4 Automatic compressor-ECM power
supply (input side)
5 Automatic compressor-ECM power
Sensor ground
Automatic compressor-ECM power
supply (output side)
12 Fin
TROUBLESHOOTING HINTS
<Condenser fan and radiator fan control>
Refer to COOLING SYSTEM
SHOOTING.
Engine (Turbo) and
sensor power supply
O N - V E H I C L E S E R V I C E
SIGHT GLASS REFRIGERANT LEVEL TEST
The sight glass is a refrigerant level indicator. To check the
refrigerant level, clean
engine. Push the
the blower switch to high and move the temperature control
dial to max cool. After operating for a few minutes in this
manner, check the sight glass.
1. If the sight glass is clear, the magnetic clutch is engaged,
Engine>
I
suction line is cool; the system has a full charge.
2. If the sight glass is clear, the magnetic clutch is engaged
and there is no significant temperature difference between
compressor suction and discharge lines; the system has
most of its refrigerant charge.
3. If the sight glass shows foam or bubbles, the system
could be low on refrigerant or the receiver drier is restricted.
The system has to be tested, leak checked then recharged
with refrigerant.
TSB Revision
Troubleshooting/On-vehicle Service
Check requirements
When the compressor ON conditions
are satisfied
The ignition switch, blower switch and
switch are all ON
The
ignition switch is ON
The ignition switch, blower switch and
switch all ON
are
The ignition switch, blower switch and
A/C switch are all ON
<Compressor control>
Refer to
sight glass and start the vehicle,
button to operate the compressor, place
discharge line is warm and the compressor
I
Terminal voltage
Battery positive
voltage
ov
Battery positive
voltage
Battery positive
voltage
o v
Battery positive
voltage