L11 CLIMATE CONTROL WORKING IRREGULARLY - Alfa - 156 - eLearn

3233109 - L11 CLIMATE CONTROL WORKING IRREGULARLY

The control unit operates the fan which sends air into the passenger compartment normally, with the pre-set flows, but this air sometimes makes the temperature in the passenger compartment too low and sometimes too high.

1	SYSTEM OPERATION CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the system cooling is correct: See Test 5040A Checking operation of air conditioner (temperature)	Continue to Step 2	The temperature decreases very slowly: insufficient fluid:	Re-pressurize the system: Op. 5040A10
2	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck that there are no faults in the climate control control unit	Continue to Step 3	Another is detected in the control unit	Continue according to the instructions for the diagnostic equipment
		Continue to Step 3	Lack of dialogue with the control unit	Restore: the connection between the climate control control unit and the diagnostic connector the climate control control unit supply. ( See E6020 AIR CONDITIONING ).
3	SYSTEM PRESSURE CHECK	All OK	Problems met	Operation
	Check the system pressure: See Test 5040B Check on operation of air conditioning system (pressures)	Continue to Step 4	High pressure does not increase or low pressure decreases too much: leaks in the circuit	Locate the leaks Op. 5040A14
			High pressure correct, low pressure very high	Replace the expansion valve Op. 5040B30
			High pressure high, low pressure below normal	Clean or replace the drier filter Op. 5040A44
			Pressure trends irregular: pipes obstructed	Wash the system: Op. 5040A10
			Pressure trends irregular: evaporator obstructed.	Replace the evaporator: Op. 5040C60
4	CONDENSER CHECK	All OK	Problems met	Operation
	Visually inspect the condition of the condenser: the heat exchange surface should not be dirty or fouled	Continue to Step 5	Condenser dirty	Clean the condenser if necessary, replace it: Op. 5040A40
5	CHECK CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'