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Functionality check of the A/C system's pressure sensor

Functionality check of the A/C system's pressure sensor

Warning

Read through the following safety regulations before you start working on the A/C system.

Wear protective glasses and impermeable gloves, since there is a risk of burn and frost injuries.

If the skin comes into contact with the refrigerant, the exposed areas should be bathed in cold water and treated like a burn.

Should the coolant get into the eyes, they must be rinsed thoroughly with water for at least 10 minutes.

Refrigerant must not intentionally be released into the atmosphere. If, however, the refrigerant is unintentionally released in the premises, open and ventilate well before continuing work.

Gases that are formed when heating a refrigerant are a health hazard and can have a serious effect on the lungs.

Work should commence as soon as possible after emptying the A/C system as residual oil may emit refrigerant vapour that could collect and leak out if the work is delayed.

Smoking and open flames must not occur when handling refrigerants.

Refrigerant containers must not be exposed to heating, because the pressure will then increase resulting in the risk of explosion.



1. Connect the diagnostic instrument.

2. Unplug the radiator fan connectors.

3. Close the bonnet until the pawl catches.

Warning

Operating with the diagnostic tool must be done from inside the cabin for safety reasons.


Important

Ensure the engine is cold before starting the test.


4. Switch the ignition on.

5. Read the AC pressure by contacting DICE via the diagnostic instrument. Select Read Values.

6. Start the engine.

Regulate the max. fan speed (ventilation fan), distribution position VENT and RECIRC.

7. Avoid pressure build-up. If properly functioning, pressure build-up should cease at approx. 27-29 bar, i.e. the compressor will be switched off. Pressure built-up should restart automatically at approx. 22-24 bar, i.e. the compressor will be switched on.

Warning

If the pressure exceeds 30 bar or if the engine coolant temperature is too high, turn off the engine!


8. In the event of faulty AC function, see Fault diagnosis strategies for electronic systems .

If the engine stops due to high coolant temperature, repeat from point 6 until the pressure sensor indicates that the threshold has been reached.

9. Upon approved function, switch off the engine.

10. Switch the ignition on. Allow the pressure to sink to 20 bar.

11. Open the bonnet. Refit the connectors to the radiator fans.

12. Note the read values for the compressor's connection and disconnection pressures in the record. Reset the car and check AC functionality.