Test results

Before starting, check the following conditions: ambient temperature around 20 °C, vehicle with doors and windows closed (during the cooling and measuring of the temperature).

With the engine on, at ambient temperature (check with the diagnostic equipment that the passenger compartment temperature sensor reading is about 20 °C), with the compressor on, place the control unit to AUTO, adjust the temperature to the maximum cold LO position, the distribution to the front position, the fan speed to 3 bars and the outside air intake function.

After around 5 minutes in these conditions check, using the diagnostic equipment, that the temperature value at the air vents decreases: from the starting temperature of about 20 °C (ambient temperature) gradually decreasing until the temperature of the front distribution air vents is between 6-10 °C.

Feel whether the air coming out of the vents varies in temperature (getting colder)

End of diagnosis

The air coming out of the climate control vents does not feel colder

Move on to Step 2

Connect the climate control system to the special repressurizing equipment and check the pressure of the system

 See Test 5040OB AIR CONDITIONING SYSTEM OPERATION CHECK (PRESSURE)

Check the correct operation of the engine cooling fan

Move on to Step 3

1. System pressure incorrect caused by refrigerant pressure too high or too low

2. Incorrect operation of engine cooling fan

1. Restore correct system pressure, restoring correct refrigerant level

 Op. 0010T84 AIR CONDITIONING SYSTEM REFRIGERANT - DEHYDRATING AND REPRESSURIZING

 See Test 5040AB REFRIGERANT CIRCUIT CHECK

Connect the diagnostic equipment and check:

- that there are no errors at the air mixing actuators;

- that there are no faults in the outside temperature sensor;

- that there are no faults in the passenger compartment temperature sensor;

- that there are no faults in the treated air sensors;

- that the solar sensor is working properly

 See Test 5040DC SOLAR SENSOR OPERATION CHECK

Move on to Step 5

1. Error at the air mixture actuators

2. Error in the outside temperature sensor

3. Error at the passenger compartment temperature sensor

4. Error in the treated air sensors

5. Solar sensor defective

1. Move on to Step 4

2. Move on to Step 4

3. Move on to Step 4

4. Move on to Step 4

5. Replace the solar sensor

 Op. 5010D56 SOLAR SENSOR - R.R. FOLLOWING ELECTRICAL SYSTEM CHECK

With the engine switched off, remove the control unit from the dashboard support and disconnect the wiring connector from the control unit. Check visually for any damage to the connector contacts and reconnect correctly to check for false connections.

Check the continuity/insulation of the electrical connection:

- for the air mixture actuators if there is an error at the mixture actuators;

- for the sensor if there is an error in the outside temperature sensor

Move on to Step 5

1. Electrical connections loose or damaged

2. Electrical connection broken or not insulated

1. Restore the electrical connections

 See E6020 AIR CONDITIONING

2. Restore the continuity/insulation of the electrical connection

 See E6020 AIR CONDITIONING

Check that the condenser is not fouled with mud

Move on to Step 6

Condenser fouled

Remove the fouling by washing

Check that the following errors do not persist:

- at the air mixture actuators (after the self-learning procedure, if necessary);

- at the outside temperature sensor;

- at the passenger compartment temperature sensor;

- at the treated air sensors

Move on to Step 7

1. Air mixing actuator error

2. Error in the outside temperature sensor

3. Error at the passenger compartment temperature sensor

4. Error in the treated air sensors

1. Replace the air mixture actuator

 Op. 5040D94 AIR CONDITIONING LEFT UPPER AIR DISTRIBUTION FLAP CONTROL MOTOR (DEFROST) - R.R.

and/or

 Op. 5040D96 AIR CONDITIONING RIGHT UPPER DISTRIBUTION FLAP CONTROL MOTOR (DEFROST) - R.R.

2. Replace the outside temperature sensor

3. Replace the climate control system control unit

 Op. 5040D15 CONTROL UNIT WITH KNOBS AND BUTTONS FOR DUAL ZONE AIR CONDITIONER - R.R.

4 Replace the treated air sensors

Remove the actuator and check through the control unit that the actuator turns checking for the presence of mechanical impediments to its rotation

End of diagnosis

1. The actuator does not turn

2. Kinematic components or flaps broken/stuck

1. Replace the mixture actuator

 Op. 5040D94 AIR CONDITIONING LEFT UPPER AIR DISTRIBUTION FLAP CONTROL MOTOR (DEFROST) - R.R.

and/or

 Op. 5040D96 AIR CONDITIONING RIGHT UPPER DISTRIBUTION FLAP CONTROL MOTOR (DEFROST) - R.R.

2. Replace the component that is faulty

Test results

Before starting, check the following conditions: ambient temperature around 20 °C, vehicle with doors and windows closed (during the cooling and measuring of the temperature).

With the engine on, at ambient temperature (check with the diagnostic equipment that the passenger compartment temperature sensor reading is about 20 °C), with the compressor on, adjust the temperature to the maximum cold position, the distribution to the front position, the selector at the 2nd speed and the outside air intake function.

After around 5 minutes in these conditions check, using the diagnostic equipment, that the temperature value decreases: from the starting temperature of about 20 °C (ambient temperature) gradually decreasing until the temperature of the front distribution air vents is between 6-10 °C.

Feel whether the air coming out of the vents varies in temperature (getting colder)

End of diagnosis

The air coming out of the climate control vents does not feel colder

Move on to Step 2

Connect the climate control system to the special repressurizing equipment and check the pressure of the system

 See Test 5040OB AIR CONDITIONING SYSTEM OPERATION CHECK (PRESSURE)

Check the correct operation of the engine cooling fan

Move on to Step 3

1. System pressure incorrect caused by refrigerant pressure too high or too low

2. Incorrect operation of engine cooling fan

1. Restore correct system pressure, restoring correct refrigerant level

 Op. 0010T84 AIR CONDITIONING SYSTEM REFRIGERANT - DEHYDRATING AND REPRESSURIZING

See test 5040AB

Check that the air conditioning high and low pressure pipes are not blocked

Move on to Step 4

1. Pipe from compressor to condenser obstructed

2. Pipe from condenser to expansion valve obstructed

1. Replace the pipe from the compressor to the condenser

2. Replace the pipe from the condenser to the expansion valve

Check that the condenser is not fouled with mud

Move on to Step 5

Condenser fouled

Remove the fouling by washing

Visually check the correct operation of the mixer kinematic components from the climate control unit temperature control knob

End of diagnosis

Incorrect operation of mixture kinematic components

Restore the kinematic components to correct working order or replace if necessary