No/Inefficient Cooling

No Or Poor Cooling
Check the following before you start fault diagnosis:
- that the compressor drive belt is intact and does not slip.
- that the flow of air through the air ducts to the indoor interior is not obstructed.
- that the flow of air through the condenser is not obstructed.

1. Cars with manual A/C: Start the engine, press the A/C button and start the ventilation fan.
Cars with ACC: Press the AUTO button.
2. Open the bonnet and check whether the compressor starts up within one minute.
3. If the compressor is in operation, check whether the low-pressure line is cold (2 to +7 °C). If it is, proceed to point 4. If the compressor does not start, the fault is electrical. Proceed to point 5.
4. If the low-pressure line is cold, check the operation of the air-blending flap. If the low-pressure line is not cold, connect a pressure-gauge stand as described in "Draining and Filling of Refrigerant". Service and Repair





5. Remove the grille and unplug the 4-pin connector of the three-stage pressure switch. Connect pin 1 to a good ground. Proceed to point 7 if the compressor starts. If the compressor does not start, check fuse 19 in fuse holder 22A in the dashboard and fuse 5 in fuse holder 342A in the engine bay. If these fuses are intact, proceed to point 6.
6. Check the A/C relay (156) on position J in relay holder 342B by connecting a jumper lead across pins 30 and 87. If the compressor still fails to start, check that battery positive is applied to pin 30.
7. Measure the resistance across pins 1 and 2 in the male connector of the three-stage pressure switch. It should be less than 1 ohm. If it is correct, proceed to point 8. If it is not correct, connect a pressure-gauge stand as described in "Draining and Filling of Refrigerant" and check that the pressure is higher than 2 bar. Service and Repair
If the pressure is higher than 2 bar, change the pressure switch. If it is not, there is probably insufficient refrigerant in the system.





8. Connect the ISAT, contact ICE and read any trouble codes. Deal with trouble code B1311 if it has been generated. Then select the ISAT command "A/C ON" in the activate menu and check that the compressor starts.
Cars with manual A/C:
If the compressor starts, check the circuit between pin 64 of the ICE control module (A/C input) and the A/C button. Also check the circuit's power supply. If the compressor fails to start, continue with point 9.
Cars with ACC:
If the compressor starts, contact the ACC, obtain readouts of any trouble codes and rectify them. If the compressor fails to start, check the wiring between pin 38 of the ACC control module and pin 64 of the ICE control module for continuity.





9. Contact the engine management system with ISAT and select the ISAT command "A/C ON" in the activate menu. Check that the compressor starts. If the compressor starts, remove the glove box and check the operation of the anti-frost thermostat. Also check the connecting leads from pin 11 of the ICE control module (A/C output) and to the A/C input of the engine management system. If the compressor does not start, carry out fault diagnosis between the engine management system's A/C output and pin 2 of the pressure switch's female connector.