Check:

• the condition of climate control system protective fuses See

• that the climate control system gas pressure is correct

  See Test 5040OB AIR- CONDITIONER SYSTEM OPERATION CHECK (PRESSURES)

• at the climate control node;
• at the CAN line;

Check that the ambient temperature is at least 5 °C.

With the engine started and the compressor on (check that the snowflake symbol lights up), set the temperature to maximum cold LO and the distribution to the front position.

Using the diagnostic equipment check that the frost sensor gives a reading of above 3.5°C, also check that the instrument does not show any short circuit for the compressor circuit. In these conditions, check that the compressor comes on by opening the bonnet and taking a look.

Connect the Examiner diagnostic equipment and check that there are no errors:

• at the engine management control unit

Keeping the Examiner diagnostic equipment connected, check the following at the engine management node:

• that there are no errors at the compressor operating relay.
• that there are no errors at the climate control system pressure sensor
• that there are no faults in the front sensor
• that there are no faults in the outside temperature sensor

Replace the sensor

Op. 5040B64 SENSOR ON EVAPORATOR FOR A/C ECU - R + R

Replace the outside temperature sensor

Op. 5010D12 OUTSIDE AIR TEMPERATURE SENSOR ON DOOR MIRROR - R+R FOLLOWING ELECTRICAL CIRCUIT CHECK

• that there are no errors at the compressor operating relay.
• that there are no errors at the climate control system pressure sensor
• that there are no errors at the fan See Test

Check correct operation of the pressure sensor by carrying out the

See Test

Replace the sensor

Op. 5040B14 AIR CONDITIONER SYSTEM MULTI-LEVEL PRESSURE SWITCH - R+R

Replace the fan

Op. 5040C30 FAN MOTOR - R+R

Check:

• the condition of climate control system protective fuses See
• that the climate control system gas pressure is correct
• See Test 5040OB AIR- CONDITIONER SYSTEM OPERATION CHECK (PRESSURES)

Check that the ambient temperature is at least 5 °C and that the outside temperature sensor reading is more than 5 °C.

With the engine started and the compressor on (check that the snowflake symbol lights up), set the control unit to the AUTO position, the temperature to maximum cold LO and the distribution to the front position. Using the diagnostic equipment check that the front sensor reading is above 3.5°C, also check that the instrument does not show any short circuits for the compressor circuit.

In these conditions, check that the compressor comes on by opening the bonnet and taking a look.

Connect the Examiner diagnostic equipment and check that there are no errors:

• at the engine management control unit
• at the climate control node
• at the CAN line

Keeping the Examiner diagnostic equipment connected, check the following at the engine management node:

• that there are no errors at the compressor operating relay.
• that there are no errors at the climate control system pressure sensor
• that there are no faults in the front sensor
• that there are no faults in the outside temperature sensor
• that there are no errors at the fan

Check the condition of the compressor operating wiring (no short circuits or open circuits)

Replace the sensor

Op. 5040B64 SENSOR ON EVAPORATOR FOR A/C ECU - R + R

Replace the outside temperature sensor

Op. 5010D12 OUTSIDE AIR TEMPERATURE SENSOR ON DOOR MIRROR - R+R FOLLOWING ELECTRICAL CIRCUIT CHECK

Check correct operation of the pressure sensor by carrying out the

See Test

Replace the sensor

Op. 5040B14 AIR CONDITIONER SYSTEM MULTI-LEVEL PRESSURE SWITCH - R+R

Check for loose connections in the electrical wiring. Disconnect/reconnect the connection to the engine support. Carry out the tests described in Test 5040CE in order,

See Test 5040C AIR CONDITIONER BOX AND COMPONENTS