198001823 - K027 ENGINE COOLANT OVERHEATING SIGNALLED BY THE INSTRUMENT

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	First, check:- the level of the coolant fluid- that there are no localized leaks- fan engagement- that there is no engine oil in the expansion tank- that the cooling radiator is not distorted or faulty- that the radiator is not dirty	Move on to Step 4	1. Level not correct2. Leaks detected3. Fan does not come on4. Presence of engine oil5. Radiator distorted6. Radiator dirty	1. Top up level2. Move on to the step involved3. Move on to Step 14. Change the head gasket5. Replace the radiator6. Clean the radiator
1	PLUG SEAL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the seal of the expansion tank cap	Move on to Step 2	Cap defective	Replace the cap
2	FAN OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic test equipment (Examiner or other instruments) to the diagnostic socket:- Detect that there are no errors memorized- Check the fan operating cycle	Move on to Step 5	Operation does not conform	Move on to Step 3
3	ENGINE COOLING ELECTRIC CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the line between the engine management and fans is working properly    See E5020 ENGINE COOLING	Move on to Step 5	1. Connections not correct2. Control unit fault	1. Restore the correct connections2. Print out the parameters detected by the control unit, then replace it    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
4	FAN OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Provide the fans with a direct power supply and check their operation    See E5020 ENGINE COOLING	Move on to Step 5	Fan not working	Replace the fans
5	CHECK INSTRUMENT PANEL OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the consistency between the control unit and instrument panel	Move on to Step 6	Readings inconsistent	Restore the correct connections with the instrument panel and replace it, if necessary    Op. 5560B10 CONTROL PANEL - R+R
6	THERMOSTAT OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the thermostat is working properly	Move on to Step 7	Thermostat not working	Bleed the cooling system. If the problem persists, replace the thermostat
7	WATER PUMP CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the water pump is working properly	Move on to Step 8	Pump faulty	Restore the correct operation of the pump. If necessary, replace it
8	COOLING SYSTEM LEAKAGE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the seal of the cooling system	Move on to Step 10	Coolant leaks found	Move on to Step 9
9	HEAD HYDRAULIC SEAL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the hydraulic seal of the cylinder head	Move on to Step 10	Seal not efficient	Replace the head
10	MONOBLOC HYDRAULIC SEAL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the hydraulic seal of the monobloc	End of diagnosis	Seal not efficient	Replace the monobloc