S50 Climate control system noisy' (in engine bay)

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Noise/vibrations › S50 Climate control system noisy' (in engine bay)

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Fault diagnosisS50 Climate control system noisy' (in engine bay)

S50 Climate control system noisy' (in engine bay)

The climate control works properly, but there is too much noise coming from the engine compartment

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Disconnect the services belt and check whether the noise disappears. WARNING: do not let the engine run for long with the belt disconnected Check whether the noise only occurs with the engine switched off	OK	Move onto step 1
		The noise disappears with the services belt disconnected	Move onto step (see S10)
		The noise only occurs with the engine switched off	Check that it is not coming from the electric fan End of diagnosis
1	PIPES AND COMPONENTS FIXING CHECK Check that the system pipes and components are correctly fixed. In the order: drier filter fixing pipes fixing (with bands and spacers) no interference between the pipes and other components in the engine compartment	OK	Move onto step 2
		Components fixing not correct	Restore the correct tightening. If necessary, replace the bands or spacers, (see Assembly 5040A) End of diagnosis
		Interference in the engine compartment	Restore the correct lay out End of diagnosis
2	COMPRESSOR FIXINGS CHECK Check that the compressor is correctly fixed to the engine	OK	Move onto step 3
2		Compessor fixing not correct	Tighten the bolt to the specified torque. Op. 5040A20 End of diagnosis
3	COMPRESSOR CHECK Check that the noise is not coming from inside the compressor NOTE: If this is the case, it is accompanied by a system malfunction. See table L01 CLIMATE CONTROL NOT WORKING	OK	Move onto step 4
3		Compressor malfunction	Replace the compressor Op. 5040A20 End of diagnosis
4	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
4		Fault persists	Incorrect selection of diagnostic procedure

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Parts & tools for this job For 1997 Alfa Romeo 156

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