22 · Diagnostics

Heater noisy / (in passenger compartment)

Fault diagnosisHeater noisy / (in passenger compartment)

HEATER NOISY / (IN PASSENGER COMPARTMENT)

The heater is working properly, but there is excessive noise coming from the duct distributor assembly

1	CHECKING ELECTRIC FAN	All OK	Problems met	Operation
		Results of the tests
	Check the climate control fan In particular, ascertain: 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 dirty	Clean the fan casing and all the ducts
		Continue to Step 2	Electric motor noisy, fan unbalanced	Replace the fan Op. 5020A30
2	CHECKING THE AIR DUCTS	All OK	Problems met	Operation
	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 3	Ducts obstructed or damaged	Repair the ducts and vents
3	CHECKING DISTRIBUTOR DUCT	All OK	Problems met	Operation
	Check whether there are foreign bodies or damaged parts inside the duct distributor assembly which could cause noise	Continue to Step 4	Air passages obstructed or damaged	Restore the operation of the distributor duct If necessary, replace one of the flaps Op. 5020A24
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

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