22 · Diagnostics

Climate control not cooling

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: Climate control › Climate control not cooling

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Fault diagnosisClimate control not cooling

CLIMATE CONTROL NOT COOLING

2.0 TB, 2.4 20V, 3.0 V6, 2.4 JTD 10V

The fan works normally and sends air to the passenger compartment according to the pre-set flows bu the air remains at the outside temperature and is not cooled.

The enablement of the engagement of the refrigerant circuit is controlled by both the climate control system control unit and the engine management control unit. Therefore if the climate control system is not cooling in certain conditions, this is correct.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the compressor drive belt	Move on to Step	Belt deteriorated	Replace the belt See in Op. 1092G10 Engine components single drive BELT - R.R.
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the tester (Examiner or other instrument) connected, check the CAN network information for: no control unit not activated; that there are no faulty control units; no control unit with faulty CAN line;	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. Error detected in the climate control system control unit	Move on to Step
			3. Error detected in the engine management control unit	Move on to Step
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check: that there are no faults in the climate control system node parameter plausibility	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. No communication between climate control system control unit	3. Restore connection between the climate control unit and diagnostic connector (Wiring Diagram ) E6020 AIR CONDITIONING
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB,3.0 V6	Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check: that there are no faults in the engine management node parameter plausibility	Move on to Step	1. Presence of faults	1.Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. Climate control circuit pressure not correct	Move on to Step
			4. No dialogue with the engine management control unit	4. Restore connection between the climate control unit and diagnostic connector (Wiring Diagram ) E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 JTD 10V	Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check: that there are no faults in the engine management node parameter plausibility	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. Climate control circuit pressure not correct	Move on to Step
			4. No dialogue with the engine management control unit	4. Restore connection between the climate control unit and diagnostic connector (Wiring Diagram ) E5050 DIESEL ENGINE ELECTRONIC MANAGEMENT
4	SYSTEM PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the system pressure Continue following the instructions in the test 5040B Air conditioning system operational check (pressure)	Move on to Step	Pressure not correct	Eliminate leaks and top up climate control system to correct level See in Op. 5040A10 Air conditioning coolant circuit - Drying and Repressurizing
5	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check the following at the climate control node: the operation of the compressor engagement relay through active diagnosis, making sure that the compressor electro-magnet coupling is not activated at the same time;	Move on to Step	1. relay does not come on and coupling not activated	Move on to Step
		Move on to Step	2. relay comes on and coupling not activated	Move on to Step
6	RELAY ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity of the relay operating circuit	Move on to Step	1. Connections not correct	1. Restore the connections (Wiring Diagram ) E6021 COMPRESSOR ENGAGEMENT
	Check the continuity of the relay operating circuit	Move on to Step	2. Relay faulty	2. Replace the relay
7	COMPRESSOR ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity of the compressor power circuit	Move on to Step	1. Connections not correct	1. Restore the connections (Wiring Diagram ) E6021 COMPRESSOR ENGAGEMENT
	Check the continuity of the compressor power circuit	Move on to Step	2. Electro-magnet coupling faulty	2. Replace the compressor complete with coupling See in Op. 5040A20 Air conditioning COMPRESSOR - R.R. - Includes fluid level check and top up if necessary
8	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace the climate control system control unit See in Op. 5040D18 Air conditioning CONTROL UNIT - R.R.

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Parts & tools for this job For 2002 Lancia Thesis

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