3233172 - S51 CLIMATE CONTROL SYSTEM NOISY' / (IN PASSENGER COMPARTMENT)

The climate control is working properly, but there is excessive noise coming from the distributor duct assembly
Results of the tests
1ELECTRIC FAN CHECKAll OKProblems metOperation

Check the climate control fan and ensure the following in particular:

  • there are no foreign bodies inside the fan casing
  • there are no vibrations at the various speeds (causing operation with the fan switched off, but the electrical connection engaged)
Continue to Step 2 Fan dirtyClean the fan casing and all the ducts
Electric motor noisy, fan unbalanced Replace the electric fan Op.   5040C30 
2ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Using the diagnostic equipment (Examiner or other instruments), carry out (in the climate control control unit ambient) the active diagnosis of the:

  • electric fan at the different speeds
  • mixture, distribution and recirculation motors
Continue to Step 3 Electric fan operation irregular Replace the electric fan Op.   5040C30 
One of the motors operation is irregularReplace one of the motors (see Assembly 5040D)
Motor flap operation irregular Replace the flap Op.   5040C24 
Presence of foreign bodies or damaged parts inside the duct distributor assembly Overhaul the duct distributor assembly Op.   5040C24 
3AIR DUCTS CHECKAll OKProblems metOperation
Check that the air ducts inside the dashboard and the vents are intact and that there are no foreign bodies which could cause noise Continue to Step 4 Ducts obstructed or damagedRestore the operation of the ducts and the vents (see Assembly 5010B)
4CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'