Mitsubishi Lancer Evolution 7. Manual — part 402
HEATER, AIR CONDITIONER AND VENTILATION
–
On-vehicle Service
55-15
COMPRESSOR DRIVE BELT ADJUSTMENT
Refer to GROUP 11 - On-vehicle Service.
DUAL PRESSURE SWITCH CHECK
1. Remove the dual pressure switch connector and connect
the high/low pressure side terminals located on the
harness side as shown in the illustration.
2. Install a gauge manifold to the high
-
pressure side service
valve of the refrigerant line. (Refer to 55-42.)
3. When the high/low pressure sides of the dual pressure
switch are at operation pressure (ON) and there is
continuity between the respective terminals, then the
condition is normal. If there is no continuity, replace the
switch.
Dual pressure switch
ON
OFF
196 20
kPa
220 20
2352 372
2940 176
Hood support rod
HEATER, AIR CONDITIONER AND VENTILATION
–
On-vehicle Service
55-16
CHARGING
1. With the handles turned back all the way (valve closed),
install the adaptor valve to the low-pressure side of the
gauge manifold.
2. Connect the charging hose (blue) to the adaptor valve.
3. Connect the quick joint (for low
-
pressure) to the charging
hose (blue).
4. Connect the quick joint (for low
-
pressure) to the low
-
pressure service valve.
NOTE
The low-pressure service valve should be connected to
the suction hose.
Caution
(1) Use tools that are suited to R134a.
(2) To install the quick joint, press section “A” firmly
against the service valve until a click is heard.
When connecting, run your hand along the hose
while pressing to ensure that there are no bends
in the hose.
5. Close the high and low
-
pressure valves of the gauge
manifold.
6. Install the vacuum pump adaptor to the vacuum pump.
7. Connect the vacuum pump plug to the vacuum pump
adaptor.
8. Connect the charging hose (yellow) to the R-134a
connection port of the vacuum pump adaptor.
9. Tighten the adaptor valve handle (valve open).
10. Open the low
-
pressure valve of the gauge manifold.
11. Turn the power switch of the vacuum pump to the ON
position.
NOTE
Even if the vacuum pump power switch is turned ON,
the vacuum pump will not operate because of the power
supply connection in step (7).
Low-pressure
valve
High-pressure
valve
Gauge manifold
Adapter
valve
Charging hose
(yellow)
Charging hose
(blue)
R-12
connection
port
Switch
R-134a
connection
port
Vacuum
pump
adaptor
Vacuum
pump
Power supply
plug
Switch
Quick
joint (for
low pres-
sure)
Low-pressure
service valve
Sleeve
A
HEATER, AIR CONDITIONER AND VENTILATION
–
On-vehicle Service
55-17
12. Turn the vacuum pump adaptor switch to the R134a side
to start the vacuum pump.
Caution
Do not operate the compressor for evacuation.
13. Evacuate to a vacuum reading of 100 kPa or higher (takes
approx. 10 minutes).
14. Turn the vacuum pump adaptor switch OFF and allow
to stand it for 5 minutes.
Caution
Do not operate the compressor in the vacuum
condition; damage may occur.
15. Carry out a leak test. (Good if the negative pressure
does not drop.)
Caution
If the negative pressure drops, increase the tightness
of the connections, and then repeat the evacuation
procedure from step (12).
16. With the handle turned back all the way (valve open),
install the charging valve to the service can.
17. Turn the handle of the adaptor valve back all the way
(valve closed), remove it from the gauge manifold and
install the service can.
18. Tighten the handle of the charging valve (valve closed)
to puncture the service can.
19. Turn the handle of the charging valve back (valve open)
and tighten the handle of the adaptor valve (valve open) to
charge the system with refrigerant.
Caution
If the service can is inverted, liquid refrigerant may
be drawn into the compressor damaging it by liquid
compression. Keep the service can upright to ensure
that refrigerant is charged in gas state.
20. If the refrigerant is not drawn in, turn the handle of the
adaptor valve back all the way (valve closed).
21. Check for gas leaks using a leak detector.
If a gas leak is detected, re-tighten the connections, and
then repeat the charging procedure from evacuation in
step (12).
Caution
The leak detector for R-134a should be used.
22. Start the engine.
23. Operate the A/C and set to the lowest temperature (MAX.
COOL).
Low-pressure
service valve
Vacuum pump
Adaptor valve
Valve open
Valve close
Charging
valve
Service can
Charging valve
Service can
(Refrigerantcontainer)
Low-pressure
service valve
HEATER, AIR CONDITIONER AND VENTILATION
–
On-vehicle Service
55-18
24. Fix the engine speed at 1,500 r/min.
25. Tighten the handle of the adaptor valve (valve open)
to charge the required volume of refrigerant.
Caution
If the service can is inverted, liquid refrigerant may
be drawn into the compressor damaging it by liquid
compression. Keep the service can upright to ensure
that refrigerant is charged in gas state.
26. After charging with refrigerant, turn the handle of the
adaptor valve back all the way (valve closed).
27. Tighten the charging valve handle (valve closed).
Remove the quick joint (for low-pressure) from the
low-pressure service valve.
NOTE
If the service can is not emptied completely, keep the
handles of the charging valve and adaptor valve closed
for the next charging.
CORRECTING LOW REFRIGERANT LEVEL IN
CASE THE SERVICE CAN IN USED
1. Install the charge valve with the handle turned all the
way back (valve open) to the service can.
2. Install the adaptor valve with the handle turned all the
way back (valve close) to the charging valve.
3. Connect the charging hose (blue) to the adaptor valve.
4. Connect the charging hose (blue) to the quick joint (for
low-pressure).
5. Tighten the handle of the charge valve (valve close),
and pierce the service can.
6. Turn the handle of the adaptor valve to bleed the air.
7. Install the quick joint (for low-pressure) to the low-pressure
service valve.
NOTE
The low-pressure service valve should be connected to
the suction hose.
Valve open
Valve close
Service can
(Refrigerant
container)
Charge valve
Adaptor valve
Charging hose (blue)
Quick joint (for low-pressure)
Quick joint
(for low-pressure)
Low-pressure
service valve
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