L10 CLIMATE CONTROL NOT COOLING - Alfa - 147 - eLearn

3022673 - L10 CLIMATE CONTROL NOT COOLING

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

Cooling circuit activation enablement 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. 1092G10
	Check the condition of the compressor drive belt	Continue to Step 1	Deteriorated belt.	Replace the belt Op. 1092G10
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner) to the diagnostic socket.Check that there are no faults in the engine management control unitCheck 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 E6020 AIR CONDITIONING
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out active diagnosis on compressor activation relay operation	Continue to Step 3	Compressor relay faulty	Replace the relay
		Continue to Step 3	Connections not correct	Restore the connection between engine management control unit, relay and compressor coupling as on the wiring diagram 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 as on the wiring diagram See E6021 COMPRESSOR ENGAGEMENT
		Continue to Step 4	Pressure switch defective	Replace the pressure switch Op. 5040B14
4	CHECK COMPRESSOR ELECTRO-MAGNET COUPLING	All OK	Problems met	Operation
	Check, in order: Compressor activation control 4 stage pressure switch See Test 5040BA CHECK ON OPERATION OF 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. 5040A34
5	CHECKING SYSTEM PRESSURE	All OK	Problems met	Operation
	Checking 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.
	Checking system pressures:	Continue to Step 6	High pressure continues to rise: the compressor cooling fan does not cut in	If the fault is associated with that of excessive engine heating See table D30 ENGINE OVERHEATING
6	CHECKING EVAPORATOR	All OK	Problems met	Operation
	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. 5040A50
			Pipe from filter to evaporator damaged	Replace the pipe Op. 5040A64
			Evaporator dirty	Replace the evaporator Op. 5040C10
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'