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Alfa Romeo GT Factory Service Manual (2003-2010)22 · Fault diagnosis

Alfa Romeo
GT Factory Service Manual (2003-2010)
Fault diagnosis
Engine
Engine coolant overheating signalled by the instrument / without visible vapour venting

22 · Diagnostics

Engine coolant overheating signalled by the instrument / without visible vapour venting

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Engine › Engine coolant overheating signalled by the instrument / without visible vapour venting

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Fault diagnosisEngine coolant overheating signalled by the instrument / without visible vapour venting

ENGINE COOLANT OVERHEATING SIGNALLED BY THE INSTRUMENT / WITHOUT VISIBLE VAPOUR VENTING

1.8 T.SPARK

0	PRELIMINARY NOTES	All OK	Problems met	Operation
		Results of the tests
	Temperature ijndication is managed by the engine control unit via a CAN line. Any faults in the electrical circuit and coolant temperature sensor are indicated by the system via activation of the engine control warning light and the indicator on the instrument panel pointing to zero.	Continue to Step 1
1	COOLANT LEVEL CHECK	All OK	Problems met	Operation
	Check the level of the coolant. Find out from the customer whether the problem has occurred previously Check the fluid consists of 100% PARAFLU Use a thermometer to check fluid temperature and compare it with the temperature displayed by the gauge	Continue to Step 2	Fluid too low and no traces of leaks noted	Restore fluid level
			100% PARAFLU	Dilute the PARAFLU 50%
			Temperature is true	Continue to Step 2
2	CHECK ON RADIATOR	All OK	Problems met	Operation
	Check 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 3	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 Op. Op. 1088B20 ENGINE COOLING RADIATOR - R + R
			Liquid with excessive traces of rust	Clean the inside of the radiator and cooling circuit
3	THERMOSTAT OPERATION CHECK	All OK	Problems met	Operation
	Check that the thermostat is working properly	Continue to Step 4	Thermostat not working	Bleed the system as per standard procedure. Replace the thermostat if the problem persists
4	CHECKING FAN OPERATION	All OK	Problems met	Operation
	Test using an Examiner Activate the fan in active diagnosis mode If the fan works, ensure it comes on at the required temperature	Continue to Step 5	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
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists

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Parts & tools for this job For 2003 Alfa Romeo GT

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