S050 CLIMATE CONTROL SYSTEM NOISY / (IN THE ENGINE COMPARTMENT)

1	COMPONENT CONCERNED	AIR CONDITIONING SYSTEM PIPE CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Air conditioning system pipes	Check that the air conditioning system pipes do not come into contact with other metal parts of the car	Go to Step 2	Contact points between the air conditioning system pipes and other metal parts of the car	Restore the correct operation
2	COMPONENT CONCERNED	AIR CONDITIONING SYSTEM NOISE CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Air conditioning system	Check for noise coming from the air conditioning system. Start the vehicle, activate the air conditioning compressor and make sure that the noise appears when the system is operated and disappears when it is deactivated	End of diagnosis	Noise due to system activation	Go to Step 3
3	COMPONENT CONCERNED	COMPRESSOR BELT CONDITION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Compressor belt	Check the compressor belt conditions	Go to Step 4	Belt worn, damaged	Replace the compressor belt Op. 1092G10 AUXILIARY COMPONENTS SINGLE DRIVE BELT - R.R.
4	COMPONENT CONCERNED	COMPRESSOR BELT TENSIONING CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Compressor belt	Check correct tensioning of the compressor belt	Go to Step 5	Incorrect belt tensioning	Tension the belt correctly
5	COMPONENT CONCERNED	COMPRESSOR SHAFT ROTATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Compressor shaft	Switch off the engine for 5 minutes, manually rotate the compressor shaft and check that it rotates smoothly and without sticking.	Go to Step 6	Rotation not smooth due to mechanical breakages inside the compressor	Replace the compressor Op. 5040A20
6	COMPONENT CONCERNED	CLUTCH SOLENOID VALVE VOLTAGE CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Clutch solenoid valve	Start the car, activate the air conditioning compressor and check that the voltage on the clutch solenoid valve is higher than 7.5 V (vehicle side connections)	Go to Step 7	Voltage lower than 7.5 V	Restore the correct connections
7	COMPONENT CONCERNED	CLUTCH SOLENOID VALVE CURRENT CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Clutch solenoid valve	Check that the current value on the clutch solenoid valve is between 3 and 4 Ω.	Go to Step 8	The current value is not between 3 and 4 Ω	Replace the compressor Op. 5040A20
8	COMPONENT CONCERNED	CLIMATE CONTROL SYSTEM COMPRESSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Climate control system compressor	Check that the climate control system compressor is operating properly, in particular make sure that it can pressurise the system carrying out the See Test 5040BE AIR CONDITIONING SYSTEM OPERATING PRESSURE CHECK	End of diagnosis	Incorrect operation of the compressor	Carry out the See Test 5040BE AIR CONDITIONING SYSTEM OPERATING PRESSURE CHECK Replace the compressor Op. 5040A20