16 · Diagnostics

U11 Bad smells from heater

Fault diagnosisU11 Bad smells from heater

The heater is working properly, but there is an unpleasant smell in the passenger compartment

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS First check that the unpleasant smells are not coming from the outside: they can be eliminated straight away by switching on the recirculation function	OK	Move onto step 1
0		Recirculation not working	Move onto step (see L56)
1	AIR SUPPLY DUCTS CHECK Check the air supply ducts: they should not be obstructed with dirt or foul smelling substances	OK	Move onto step 2
1		Vents malfunction	Wash the ducts (after removing the electric fan) Restore the ducts (see Assembly 5010B) End of diagnosis
2	HEATER RADIATOR CHECK Check the heater radiator: the outer fins should not be obstructed with dirt or other substances	OK	Move onto step 3
2		Radiator dirty or obstructed	Clean the radiator or replace it Op. 5020A30 End of diagnosis
3	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
3		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 1997 Alfa Romeo 156

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