22 · Diagnostics

Engine coolant leaks

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: Consumption / leaks / wear › Engine coolant leaks

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Fault diagnosisEngine coolant leaks

ENGINE COOLANT LEAKS

2.4 JTD 10V · Additional heater

An engine coolant leak can be seen with consequent dripping and/or fouling of the engine.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out an initial visual inspection to locate the component that is leaking or the area of the leak. Check that there is no engine oil in the coolant. Check that there is no water or emulsion in the engine oil.	Move on to Step	1. Leak from the water pipes	Move on to Step
			2. Leak from the radiator	Move on to Step
			3. Leak from the expansion tank	Move on to Step
			4. Leak from the water pump	Move on to Step
			5. Leak from the thermostat unit	Move on to Step
			6. Leak from the heater radiator	Move on to Step
			7. External leak from the cylinder head	Move on to Step
			8. Leak from the cylinder block/cylinder head plugs	Move on to Step
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 JTD 10V	Carry out an initial visual inspection to locate the component that is leaking or the area of the leak. Check that there is no engine oil in the coolant. Check that there is no water or emulsion in the engine oil.	Move on to Step	1. Leak from the water pipes	Move on to Step
			2. Leak from the radiator	Move on to Step
			3. Leak from the expansion tank	Move on to Step
			4. Leak from the water pump	Move on to Step
			5. Leak from the thermostat unit	Move on to Step
			6. Leak from the additional heater	Move on to Step
			7. Leak from the heater radiator	Move on to Step
			8. External leak from the cylinder head	Move on to Step
			9. Leak from the cylinder block/cylinder head plugs	9. Replace the plugs
1	PIPE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the pipes and the seal. More specifically: the condition of the bands making sure they are correctly fitted; the condition of the hoses, connectors and plugs	Move on to Step	Tightening not correct or components damaged	Restore the correct tightening or replace the components involved
2	RADIATOR CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the radiator	Move on to Step	Radiator damaged or distorted	Replace the radiator See in Op. 1088B24 Engine cooling RADIATOR - R.R. for versions with air conditioning
3	EXPANSION TANK CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually check: the condition of the expansion tank; the seal of the cap Check the condition of the cap breather valve	Move on to Step	Tank damaged or distorted	Replace the tank or the cap See in Op. 1088B10 Engine coolant SUPPLY RESERVOIR - R.R.
4	WATER PUMP CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually check: the condition of the water pump; the seal of the gaskets	Move on to Step	Water pump faulty	Replace the water pump or the gaskets See in Op. 1088C12 WATER PUMP - R.R. for versions with air conditioner
5	THERMOSTAT UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually check: the condition of the thermostat unit; the seal of the gaskets	Move on to Step	Thermostat unit faulty	Replace the thermostat unit or the gaskets See in Op. 1088C30 THERMOSTAT UNIT - R.R.
6	ADDITONAL HEATER CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 JTD 10V	Check the condition of the additional heater assembly	Move on to Step	Heater damaged or distorted	Replace the additional heater
7	HEATER RADIATOR CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the heater radiator	Move on to Step	Heater radiator damaged or distorted	Replace the heater radiator See in Op. 5030A50 Automatic heater RADIATOR - R.R.
8	CYLINDER HEAD CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the head.Check: Cylinder head plane correct planarity Cylinder head support surface on cylinder block correct planarity;	Move on to Step	1. Cylinder head plane defective	1. Regrind the cylinder head plane
			2. Cylinder block plane defective	2. Regrind the cylinder block plane
			3. Planes correct, head gasket faulty	3. Change the head gasket
9	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

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Parts & tools for this job For 2002 Lancia Thesis

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