2888446 - S10 ENGINE WHILSTLING / SERVICES BELT NOISY'

There is a whistling (extremely high intensity noise) coming from the area of the engine which varies with the engine speed
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Check the condition of the auxiliary shaft drive belt and check that the tension is correctCheck that, as the electrical loads engaged increase, the whistling does not increase, but remains constantContinue to Step 1Water pump and alternator belt tension incorrectAdjust belt tension Op.   1092B50 
Power steering pump belt incorrectAdjust belt tension Op.   1092C12 
Compressor belt tension incorrectAdjust belt tension Op. 1092D14
The whistling increases: alternator faulty (voltage regulator not working properly)Replace the voltage regulator Op.   5530A22 
The whistling increases: alternator faulty (connections between alternator and battery not correct)Restore the connections ( See   E5010  STARTING AND RECHARING
1CHECK AUXILIARY SHAFT BELTAll OKProblems metOperation
Disconnect the belt to see if the whistling stops. ATTENTION do not run the engine too long with the belt disconnected The whistling disappears:Continue to Step 2The whistling remains constantRestore the water pump and alternator belt control system and the mobile belt tensioner in particular Op.   1092B82 
2CHECK ON COMPONENTS DRIVEN BY THE BELTAll OKProblems metOperation

Check the operation of all the components driven by the belt:

  • water pump
  • power assisted steering pump
  • air conditioning compressor
Continue to Step 3Water pump faultyRestore or replace the water pump Op.   1088C12 
Power assisted steering pump faultyRestore or replace the power assisted steering pump Op. 4130B26
Air conditioning compressor faultyRestore or replace the compressor Op.   5040A20 
3CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'