323001364 - S010 ENGINE WHILSTLING / SERVICES BELT NOISY

There is a high frequency noise coming from the engine whose intensity varies with the number of revs
TEST RESULTS
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Check the condition of the auxiliary drive belt and make sure the tension is correct.Check whether the noise remains constant when the electrical loads switched on increasesMove on to Step 11. Belt worn2. Tension not correct3. Noise increases1. Replace belt.2. Adjust the belt tension3. Move on to Step 1
1ALTERNATOR CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the alternator is working properly, in particular:- Voltage regulator- Connections between alternator and batteryMove on to Step 21. Voltage regulator defective2. Connections not correct1. Replace the pressure regulator    Op. 5530A10 ALTERNATOR - R+R 2. Restore the correct connections.
2AUXILIARY UNITS BELT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check whether the noise disappears if the belt is disconnected
Move on to Step 31. The noise disappears.2. The noise remains constant.1. Move on to Step 32. Move on to Step 4
3AIR CONDITIONING COMPRESSOR CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the operation of the air conditioning compressor.Move on to Step 4Air conditioning compressor faulty.Repair or replace the compressor    Op. 5040A20 AIR CONDITIONING COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY
4BELT TENSIONER CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the condition of the belt tensioner bearings.End of diagnosis1. Fixed belt tensioner faulty.2. Moving belt tensioner faulty.1. Replace fixed belt tensioner.2. Replace moving belt tensioner.