22 · Diagnostics

Climate control not cooling

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Climate control › Climate control not cooling

‹ Prev Fan'' will not work at different speeds Next › Climate control too cold

Fault diagnosisClimate control not cooling

CLIMATE CONTROL NOT COOLING

The fan works properly and sends air into the interior compartment in accordance with the set flows, but this air remains at the external temperature and is not cooled.

The enablement to switch on the refrigerating circuit is controlled by the climate control and engine management control units. So if the air conditioning does not cool under particular conditions, this is correct.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the compressor drive belt	Continue to Step 1	Tension incorrect	Replace the belt Op. Op. 1092G10 SINGLE ENGINE BELT R R
	Check the condition of the compressor drive belt	Continue to Step 1	Deteriorated belt.	Replace the belt Op. Op. 1092G10 SINGLE ENGINE BELT R R
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner) to the diagnostic socket. Check that there are no fault in the engine management control unit. Check that there are no faults in the climate control control unit	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
			An error is detected in climate control unit	Continue following the instructions for the diagnostic equipment
			Lack of communication with the climate control system control unit (CAN line error)	Restore connection between climate control system control unit and body computer connector See See E6020 AIR CONDITIONING
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner) connected to the engine management node, carry out active diagnosis on the operation of the compressor engagement relay	Continue to Step 3	Compressor engagement relay faulty	Replace the relay
		Continue to Step 3	Connections not correct	Restore the connection between engine management control unit, relay and compressor coupling See See E6021 COMPRESSOR ENGAGEMENT
3	CHECK COMPRESSOR ACTIVATION ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check the operation of the compressor electro-magnet coupling.	Continue to Step 4	Connections not correct	Restore the connections between the climate control unit, pressure switch and control unit See See E6021 COMPRESSOR ENGAGEMENT
		Continue to Step 4	Pressure switch defective	Replace the pressure switch Op. Op. 5040B14 AIR CONDITIONER SYSTEM MULTI-LEVEL PRESSURE SWITCH - R+R
4	CHECK COMPRESSOR ELECTRO-MAGNET COUPLING	All OK	Problems met	Operation
	Check, in order: Compressor activation control 4 stage pressure switch Connection between compressor activation relay and the control.	Continue to Step 5	Defective compressor coupling.	Replace the compressor complete with coupling Op. Op. 5040A34 PULLEY WITH COMPRESSOR ELECTROMAGNETIC COUPLING - R+R WITH COMPRESSOR REMOVED
5	CHECKING SYSTEM PRESSURE	All OK	Problems met	Operation
	Check the system pressures	Continue to Step 6	High pressure does not increase or low pressure decreases too much: leaks in the circuit	Locate the leaks and restore the correct operation.
	Check the system pressures	Continue to Step 6	High pressure continues to rise: the compressor cooling fan does not intervene	If the fault is associated with that of excessive engine heating, proceed as described in See table See table K25 ENGINE COOLANT TEMPERATURE GAUGE NOT WORKING
6	CHECKING EVAPORATOR	All OK	Problems met	Operation
1.9 JTD 16V Two-zone climate control system	Check high and low pressure pipe for leaks, and condition of evaporator	Continue to Step 7	Pipe from condenser to drier filter damaged	Replace the pipe Op. 5040A52
1.9 JTD 16V Two-zone climate control system		Continue to Step 7	Evaporator dirty	Replace the evaporator Op. Op. 5040C64 A/C MANUAL CONTROL SWITCH (ONE) - R+R
2.0 JTS 3.2 V6 Two-zone climate control system	Check high and low pressure pipe for leaks, and condition of evaporator	Continue to Step 7	Pipe from compressor to condenser damaged	Replace the pipe Op. Op. 5040A50 PIPE FROM COMPRESSOR TO AIR CONDITIONER CONDENSER - R+R
			Pipe from condenser to filter damaged	Replace the pipe Op. 5040A52
			Pipe from filter to evaporator damaged	Replace the pipe Op. 5040A56
			Evaporator dirty	Replace the evaporator Op. Op. 5040C64 A/C MANUAL CONTROL SWITCH (ONE) - R+R
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

‹ Prev Fan'' will not work at different speeds Next › Climate control too cold

Parts & tools for this job For 2003 Alfa Romeo GT

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