Mitsubishi Grandis. Manual — part 327

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-193

25.After charging with refrigerant, turn the handle of

the adaptor valve back all the way (valve closed).

26.Tighten the charging valve handle (valve closed).

Remove the quick joint (for low-pressure) from the
low-pressure service valve.

27.Remove the service can.

NOTE: If the service can is not emptied
completely, keep the handles of the charging
valve and adaptor valve closed for the next
charging.

CHECK THE REFRIGERANT LEVEL

M1552021700013

Remove the refrigerant by the flon reclaim machine
and replenish the specified quantity of refrigerant.
NOTE: Refer to the Refrigerant Recovery and
Recycling Unit instruction Manual for operation of the
unit.

CORRECTING LOW REFRIGERANT
LEVEL IN CASE THE SERVICE CAN IN
USED

M1552014600122

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.

8. Start the engine.
9. Operate the air conditioner and set at the lowest

temperature (MAX. COOL).

10.Fix the engine speed at 1,500 r/min.
11.Tighten the handle of the adaptor valve (valve

open), and replenish refrigerant while checking
the quantity through the sight glass.

12.After replenishing is completed, turn the handle of

the adaptor valve all the way back (valve close),
and remove the quick joint.
NOTE: When there is remainder of refrigerant in
the service can, keep it for next use with the
charge value and the valve of the adaptor valve
being closed.

PERFORMANCE TEST

M1552001400452

1. The vehicles to be tested should be in a place that

is not in direct sunlight.

AC300372 AB

Valve open

Valve close

Service can
(Refrigerant
container)

Charge valve

Adaptor valve

Charging hose (blue)

Quick joint (for low-pressure)

AC300373

Quick joint
(for low-pressure)

Low-pressure
service valve

AB

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-194

2. Close the high and low-pressure valve of the

gauge manifold.

3. Connect the charging hose (blue) to the

low-pressure valve and connect the charging
hose (red) to the high-pressure valve of the gauge
manifold.

CAUTION

• To connect 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.

4. Install the quick joint (for low-pressure) to the

charging hose (blue), and connect the quick joint
(for high-pressure) to the charging hose (red).
NOTE: The high-pressure service valve is on the
A/C pipe and the low-pressure service valve is on
the suction hose.

5. Connect the quick joint (for low-pressure) to the

low-pressure service valve and connect the quick
joint (for high-pressure) to the high-pressure
service valve.

6. Start the engine.

7. Set the A/C controls as follows:

When the front A/C test

• A/C switch: A/C − ON position

• Mode selection: FACE position

• Temperature control: MAXIMUM COOLING

position

• Air selection: RECIRCULATION position

• Blower switch: Fast position

When the rear A/C test

• The front A/C should be set as above

• A/C switch: A/C ON position

• Temperature control: MAXIMUM COOLING

position

• Blower switch: Fast position

8. Adjust engine speed to 1,500 r/min with A/C

clutch engaged.

9. Engine should be warmed up with doors and

windows opened.

10.Insert a thermometer in the centre air outlet and

operate the engine for 20 minutes.

NOTE: If the clutch cycles, take the reading before
the clutch disengages.
11.Note the discharge air temperature.

AC001388

Low-pressure
valve

High-pressure
valve

Gauge manifold

Charging
hose (red)

A

Sleeve

Charging
hose (blue)

Adaptor valve
(for low-
pressure)

Low-
pressure
service
valve

High-
pressure
service
valve

AB

Adaptor valve
(for high-
pressure)

AC311352

AC312157AB

Thermometer

AC312674

Thermometer

AB

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-195

PERFORMANCE TEMPERATURE CHART
FRONT-A/C TEST

FRONT-A/C TEST

SIMPLE INSPECTION OF THE A/C
PRESSURE SENSOR

M1552014700152

1. Assemble a gauge manifold on the high pressure

service valve.

2. Disconnect the A/C pressure sensor connector

and connect the special tool test harness
(MB991658) as shown.

3. Start the engine and then turn ON the air

conditioner switch.

4. At this time, check to see that the voltage of the

A/C pressure sensor connector terminal No. 2
reflects the specifications of the figure.
NOTE: The allowance shall be defined as

±

5%.

Garage ambient temperature

°C

20

25

30

35

Discharge air temperature

°C

3.5

− 5.5

3.5

− 5.5

4.5

− 6.5

5.5

− 7.5

Compressor high pressure kPa

1, 050

− 1, 250 1, 050 − 1, 250 1,400 − 1,600

1,650

− 1,850

Compressor low pressure kPa

120

− 140

120

− 140

130

− 150

160

− 180

Garage ambient temperature

°C

20

25

30

35

Discharge air temperature

°C

5.5

− 7.5

5.5

− 7.5

6.5

− 8.5

7.5

− 9.5

Compressor high pressure kPa

1, 150

− 1, 350 1, 150 − 1,350 1,500 − 1,700

1,750

− 1,950

Compressor low pressure kPa

130

− 150

130

− 150

140

− 160

180

− 200

AC301987

AE

A/C pressure sensor

AC303865

MB991658

AB

A/C
pressure
sensor side

Harness side

AC208297

0

1

2

3

1

2

3

4

5

AB

Output voltage

(V)

Refrigerant pressure (MPa)

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-196

RELAY CONTINUITY CHECK

M1552008800439

A/C COMPRESSOR RELAY CONTINUITY
CHECK

REAR BLOWER RELAY CONTINUITY
CHECK

Battery voltage Tester

connection

Specified
condition

Not applied

4

− 5

Open circuit

• Connect

terminal 3 to
the positive
battery
terminal

• Connect

terminal 1 to
the negative
battery
terminal

4

− 5

Less than 2
ohms

AC312170

4

3

1

A/C compressor relay

AB

2

Battery voltage Tester

connection

Specified
condition

Not applied

1

− 4

Open circuit

• Connect

terminal 3 to
the positive
battery
terminal

• Connect

terminal 2 to
the negative
battery
terminal

1

− 4

Less than 2
ohms

AC312183

<LHD>

<RHD>

Rear blower relay

Rear blower relay

2

4

3

1

AB