S51 Climate control system noisy' (in passenger compartment)
- Make
- Alfa Romeo
- Model
- 156 Factory Service Manual
- Year
- 1997–2002
- Section
- Noise/vibrations › S51 Climate control system noisy' (in passenger compartment)
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
| Step | Test procedure | Result | Action |
|---|---|---|---|
| 1 | ELECTRIC FAN CHECK Check the climate control fan and ensure the following in particular:
| OK | |
| Fan dirty |
End of diagnosis | ||
| Electric motor noisy, fan unbalanced |
End of diagnosis | ||
| 2 | ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT Using the diagnostic equipment (Examiner or other instruments), carry out (in the climate control control unit ambient) the active diagnosis of the:
| OK | |
| Electric fan operation irregular |
End of diagnosis | ||
| One of the motors operation is irregular |
End of diagnosis | ||
| Motor flap operation irregular |
End of diagnosis | ||
| Presence of foreign bodies or damaged parts inside the duct distributor assembly |
End of diagnosis | ||
| 3 | AIR DUCTS CHECK Check that the air ducts inside the dashboard and the vents are intact and that there are no foreign bodies which could cause noise | OK | |
| Ducts obstructed or damaged |
End of diagnosis | ||
| 4 | CHECK CORRECT OPERATION Check that the fault is no longer present | OK | End of diagnosis |
| Fault persists | Incorrect selection of diagnostic procedure |
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