169002116 - S50 CLIMATE CONTROL SYSTEM NOISY'' / (IN THE ENGINE COMPARTMENT)

The climate control is working normally but there is excessive noise coming from the engine compartment.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
Check that the quantity of gas in the system is correct.Disconnect the services belt and check whether the noise disappears.Check whether the noise only occurs with the engine switched off.
Do not let the engine run for long with the belt detached
Move on to Step 1Quantity of gas incorrectRestore the correct refilling of the climate control system    Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM DEHYDRATE AND RECHARGE
The noise disappears when the services belt is disconnectedContinue as instructed in theSee table S20 GEARBOX DIFFERENTIAL UNIT NOISY'/ / GENERAL
The noise only occurs with the vehicle stationaryCheck that it is not coming from the fan or the water pump or the alternator
The noise does not disappearRenew the belt and move on to Step 1
1CHECK ON FASTENING OF PIPES AND COMPONENTSAll OKProblems encounteredOperation

Check that the system pipes and components are correctly fastened. In order:

  • fastening of compressor to crossmember
  • fastening of pipes (by bands and spacers)
  • no interference between pipes and other components in the engine compartment
Move on to Step 2Fastening of components incorrectRestore the correct tightening.
Interference in the engine compartmentRestore the correct layout of the pipes
2COMPRESSOR FASTENINGS CHECKAll OKProblems encounteredOperation
Check whether the compressor magnetic coupling shows signs of overheating. If it does, replace the compressor, if it does not, check for interference between the mangetic coupling moving plate and the pulley. Check for any sliding of the magnetic coupling plate. Check the wear of the pulley bearing with the compressor switched off by rotating the moving plate in both directions of rotation.End of diagnosisSigns of overheating on the compressor magnetic couplingReplace the compressor    Op. 5040A20 AIR CONDITIONER COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY
Oil on the plateClean the oil from the plate and search for the oil leak
Bearing wornReplace the compressor    Op. 5040A20 AIR CONDITIONER COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY
Mark the defect found on the replaced component