125000507 - D36 ENGINE COOLANT OVERHEATING SIGNALLED BY THE INSTRUMENT / WITH VISIBLE VAPOUR VENTING

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		Results of the tests
1	PRELIMINARY CHECKS	All OK	Problems met	Operation
	Check the level of the coolant.Find out from the customer whether the problem has occurred previouslyCheck the condition of the radiator. In particular, check for signs of deformation - traces of leaks - external dirt - fluid with excessive traces of rust.	Continue to Step 2	Level too low: the customer has never complained of the problem	Restore the correct level
			Level too low: repeated problem	See table See table X10 ENGINE COOLANT LEAKS
			Radiator distorted	Replace the radiator Op.    Op. 1088B20 ENGINE COOLING RADIATOR - R + R
			Radiator dirty	Clean the radiator Op. 1088A20
			Radiator is leaking	Replace the radiator
			Liquid with excessive traces of rust	Clean the inside of the radiator and cooling circuit
2	THERMOSTAT OPERATION CHECK	All OK	Problems met	Operation
	Check that the thermostat is working properly	Continue to Step 3	Thermostat not working	Bleed the system as per standard procedure. Replace the thermostat if the problem persists
3	CHECKING FAN OPERATION	All OK	Problems met	Operation
	Test using an ExaminerActivate the fan in active diagnosis modeIf the fan works, ensure it comes on at the required temperature	Continue to Step 4	Fan not working	Activate the fan motor directly, replace if it does not work, check the following in order if it does work: specific fuses and relays on the engine bay control unit, condition of 1st speed resistor, specific wiring continuity and insulation. Check that the control unit activates the fan speed relays. If not, replace the i.e. control unit. If it does, replace the engine bay control unit
4	BUBBLING CHECK	All OK	Problems met	Operation
	With the engine running, check there is no gurgling in the coolant reservoir	Continue to Step 5	Presence of gurgling in the coolant	Replace the cylinder head gasket Op.    Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
			No gurgling	Check the condition of the coolant pump vanes
5	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''