18 · Diagnostics

L15 Climate control unit does not heat

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2002
Section: Climate control › L15 Climate control unit does not heat

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Fault diagnosisL15 Climate control unit does not heat

L15 Climate control unit does not heat

The fan works properly and sends air into the interior compartment in accordance with set flow patterns, but this air does not ensure the required heating.

Step	Test procedure	Result	Action
1	CHECKING WITH DIAGNOSTIC EQUIPMENT Connect the diagnostic equipment (Examiner) to the diagnostic socket. Check that there are no faults in the climate control control unit	OK	Move onto step 2
		An error is detected in the control unit	Continue following the instructions for the diagnostic equipment End of diagnosis
		Lack of dialogue with the control unit	Restore connection between climate control system control unit and body computer Wiring diagram E6020 AIR CONDITIONER End of diagnosis
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT Using the diagnostic equipment (Examiner), carry out active diagnosis on the mixing motor (for manual versionj) or the two right and left mixing motors (for automatic version)	OK	Move onto step 3
		Mixing motor connection faulty	Restore the connections Wiring diagram E6020 AIR CONDITIONER End of diagnosis
		Fault in left mixing motor flap	Replace the motor Op. 5040D84 End of diagnosis
		Fault in right mixing motor flap	Replace the motor Op. 5040D84 End of diagnosis
		Fault in mixing ports	Replace the mixing motor ports see under Op. 5040C24 End of diagnosis
3	CHECKING HEATER PIPES Check the efficiency and seal of the supply and return pipes to/from the heater.	OK	Move onto step 4
		Pipes incorrectly connected	Restore the correct connection End of diagnosis
		Pipes damaged	Replace the pipes Op. 5040C24 End of diagnosis
4	CHECKING HEATER RADIATOR Check the seal of the heater radiator	OK	Move onto step 5
4		Radiator dirty or obstructed	Clean the radiator and replace if necessary Op. 5040C24 End of diagnosis
5	CHECKING CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
5		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev L12 Climate control unit cools too much Next › L16 Climate control re-circulation not working

Parts & tools for this job For 2000 Alfa Romeo 147

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