22 · Diagnostics

Engine coolant leaks

Make: Lancia
Model: Ypsilon Factory Service Manual
Year: 2003–2011
Section: Consumption /leaks/ wear › Engine coolant leaks

‹ Prev Engine coolant consumption Next › Engine oil leaks

Fault diagnosisEngine coolant leaks

ENGINE COOLANT LEAKS

A leak of engine coolant is seen with dripping and/or fouling of the engine

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily carry out a visual inspect to locate the component or area which is leaking. Check that there is no engine oil in the coolant. Check that there is no water or emulsion in the engine oil. If the visual inspection is not sufficient, wash the engine, dry it, start it and run it slowly until it comes up to temperature; to identify the leak, if necessary, carry out a leak test on the system ( Op. 0510C30)	No leak located: Continue to Step 1	Leak from the pipes	Continue to Step 1
			Leak from the radiator	Continue to Step 2
			Leak from the expansion tank	Continue to Step 3
			Leak from the water pump	Continue to Step 4
			Leak from the thermostat unit	Continue to Step 5
			Leak from the cylinder head	Continue to Step 6
			Leak from the heater radiator	Continue to Step 7
			Seepage of oil or water between the engine and the cooling circuit	Continue to Step 8
1	PIPES CHECK	All OK	Problems met	Operation
	Check the condition and seal of the pipes. In particular: condition and correct fitting of the bands condition of hoses, connectors and plugs	Continue to Step 2	Tightening not correct or components damaged	Restore the correct tightening or replace the components involved
2	CHECK ON RADIATOR	All OK	Problems met	Operation
1.2 16v	Check the condition of the radiator	Continue to Step 3	Radiator damaged or distorted	Replace the radiator ( Op. 1088B20)
1.2 16v	Check the condition of the radiator	Continue to Step 3	Radiator damaged or distorted	Replace the radiator (Op. 1088B24)
3	EXPANSION TANK CHECK	All OK	Problems met	Operation
	Visually inspect: the condition of the expansion tank the seal of the plug Check the condition of the breather valve cap	Continue to Step 4	Tank damaged or distorted	Replace the tank or the cap
4	CHECK ON WATER PUMP	All OK	Problems met	Operation
1.2 16v	Visually inspect: the condition of the water pump the seal of the gaskets	Continue to Step 5	Water pump faulty	Replace the water pump or the gaskets ( Op. 1088C10)
1.2 16v	Visually inspect: the condition of the water pump the seal of the gaskets	Continue to Step 5	Water pump faulty	Replace the water pump or the gaskets (Op. 1088C12)
5	THERMOSTAT UNIT CHECK	All OK	Problems met	Operation
	Visually inspect: the condition of the thermostat group the seal of the gaskets	Continue to Step 6	Thermostat group faulty	Replace the thermostat unit or the seals ( Op. 1088C30)
6	CHECKING CYLINDER HEAD GASKET	All OK	Problems met	Operation
1.2 16v	Check: that the cylinder head tightening is correct that the gasket is not leaking	Continue to Step 7	Cylinder head tightening not correct	Restore the correct tightening
1.2 16v		Continue to Step 7	Gasket damaged	Replace the gasket ( Op. 1016C10)
1.2 16v	Check: that the cylinder head tightening is correct that the gasket is not leaking	Continue to Step 7	Cylinder head tightening not correct	Restore the correct tightening
1.2 16v		Continue to Step 7	Gasket damaged	Replace the gasket (Op. 1016C11)
7	HEATER RADIATOR CHECK	All OK	Problems met	Operation
	Check the condition of the heater radiator	Continue to Step 8	Heater radiator damaged or distorted	Replace the radiator (Op. 5020A50)
8	CYLINDER BLOCK/CRANKCASE PLANE CHECK	All OK	Problems met	Operation
1.2 16v	Remove the cylinder head ( Op. 1016C10). Check that there are no: oily dross on the valves; defects in the cylinder block/crankcase plane; defects in the cylinder head gasket;	Continue to Step 9	Cylinder block/crankcase plane defective	Reface the cylinder block/crankcase
1.2 16v		Continue to Step 9	Presence of oily dross on the valves	Overhaul the cylinder head ( Op. 1016E10)
1.2 16v	Remove the cylinder head (Op. 1016C11). Check that there are no: oily dross on the valves; defects in the cylinder block/crankcase plane; defects in the cylinder head gasket;	Continue to Step 9	Cylinder block/crankcase plane defective	Reface the cylinder block/crankcase
1.2 16v		Continue to Step 9	Presence of oily dross on the valves	Overhaul the cylinder head ( Op. 1016E10)
9	CHECK ON 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'

‹ Prev Engine coolant consumption Next › Engine oil leaks

Parts & tools for this job Staging For 2003 Lancia Ypsilon

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