Functionality check of the A/C system's pressure sensor
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Functionality check of the A/C system's pressure sensor
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Warning
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Read through the following safety regulations before you start working on the A/C system.
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Wear protective glasses and impermeable gloves, since there is a risk of burn and frost injuries.
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If the skin comes into contact with the refrigerant, the exposed areas should be bathed in cold water and treated like a burn.
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Should the coolant get into the eyes, they must be rinsed thoroughly with water for at least 10 minutes.
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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.
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Gases that are formed when heating a refrigerant are a health hazard and can have a serious effect on the lungs.
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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.
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Smoking and open flames must not occur when handling refrigerants.
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Refrigerant containers must not be exposed to heating, because the pressure will then increase resulting in the risk of explosion.
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1.
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Connect the diagnostic instrument.
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2.
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Unplug the radiator fan connectors.
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3.
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Close the bonnet until the pawl catches.
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Warning
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Operating with the diagnostic tool must be done from inside the cabin for safety reasons.
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Important
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Ensure the engine is cold before starting the test.
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4.
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Switch the ignition on.
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5.
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Read the AC pressure by contacting
DICE via the diagnostic instrument. Select Read Values.
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6.
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Start the engine.
Regulate the max. fan speed (ventilation fan), distribution position VENT and RECIRC.
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7.
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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.
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Warning
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If the pressure exceeds 30 bar or if the engine coolant temperature is too high,
turn off the engine!
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9.
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Upon approved function, switch off the engine.
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10.
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Switch the ignition on. Allow the pressure to sink to 20 bar.
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11.
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Open the bonnet. Refit the connectors to the radiator fans.
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12.
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Note the read values for the compressor's connection and disconnection pressures in the record. Reset the car and check AC functionality.
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