D30 ENGINE OVERHEATING / WITH THE FAN WORKING - Alfa - 156 - eLearn

3233021 - D30 ENGINE OVERHEATING / WITH THE FAN WORKING

The reading on the special instrument in the panel shows a high engine coolant temperature

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Carry out a preliminary check on the engine coolant level Then check: regular engagement of cooling fan engine oil level condition of water pump drive belt	Continue to Step 1	Insufficient engine coolant level	Top up the engine coolant level Op. 1088A10
			Electric fan does not switch on	See table D31
			Tension incorrect	Replace the belt Op. 1092G10
			Engine oil level too low	Top up the engine oil level Op. 1084A10
1	TEMPERATURE GAUGE OPERATION CHECK	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket (in the engine management control unit ambient): read the engine temperature value shown amongst the parameters and compare it with the instrument reading	Continue to Step 2	Values do not agree.Instrument reading faulty	See table K25
2	VISUAL INSPECTION OF CCOLANT EXPANSION TANK	All OK	Problems met	Operation
	Start up the engine and visually check that there are no air bubbles in the expansion tank	Continue to Step 3	Air in the cooling circuit	Eliminate the air from the cooling circuit
3	CYLINDER HEAD GASKET CHECK	All OK	Problems met	Operation
1.6 TS 1.8 TS [d] 1.9 JTD 8v 2.4 JTD 10v	Check: that the cylinder head tightening is correct the gasket seal	Continue to Step 4	Cylinder head tightening not correct	Restore correct tightening
1.6 TS 1.8 TS [d] 1.9 JTD 8v 2.4 JTD 10v		Continue to Step 4	Gasket damaged	Replace the gasket Op. 1016C11
2.5 V6	Check: that the cylinder head tightening is correct the gasket seal	Continue to Step 4	Cylinder head tightening not correct	Restore correct tightening
2.5 V6		Continue to Step 4	Gasket damaged	Replace the gasket Op. 1016D11
4	THERMOSTAT GROUP CHECK	All OK	Problems met	Operation
	Check: the condition of the thermostat group	Continue to Step 5	Thermostat group faulty	Replace the thermostat group Op. 1088C40
5	PIPE CHECK	All OK	Problems met	Operation
	Check the condition and seal of the pipes. In particular: no obstructions condition of hoses, connectors and plugs	Continue to Step 6	Tightening not correct or components damaged	Restore the correct tightening or replace the components involved (see Assembly 1088D)
6	RADIATOR CHECK	All OK	Problems met	Operation
	Check the condition of the radiator	Continue to Step 7	Radiator damaged or distorted	Reaplce the radiator Op. 1088B24
7	WATER PUMP CHECK	All OK	Problems met	Operation
	Check: the condition of the water pump the seal of the gaskets	Continue to Step 8	Water pump faulty	Replace the water pump or Op. 1088C12
8	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'