CITROEN C2 Handbook page 263

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Principal problem
The aircon compressor does not turn
or stops suddenly
Aircon circuit diagnosis table
Symptom
The clutch of the aircon compressor does not
engage, or disengages suddenly
The clutch of the aircon compressor remains
engaged and stops suddenly
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Possible causes
Aircon compressor clutch
Lack of aircon fluid in the aircon circuit
Aircon pressostat
Aircon evaporator sensor
Electrical circuit (wiring, fuses, etc.)
Auxiliaries drive belt
Aircon compressor
Filtering and drying cartridge
Aircon pressure reducer
Leak of aircon fluid
Aircon compressor clutch