22 · Diagnostics

Engine coolant consumption

Fault diagnosisEngine coolant consumption

ENGINE COOLANT CONSUMPTION

1.6 TS, 2.0 TS

The coolant consumption is high (it needs topping up frequently)

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Bleed the air and check that the fault no longer occurs Check whether there is white smoke in the exhaust		The fault is still present	Continue to Step 1
			There is white smoke in the exhaust	Continue to Step 4
1	CAP EFFICIENCY CHECK	All OK	Problems met	Operation
	Check the efficiency of the cap	Continue to Step 2	Cap not working properly	Replace the cap
2	SYSTEM LEAKAGE CHECK	All OK	Problems met	Operation
	Carry out the cooling system leak test Op. 0510C30	Continue to Step 3	There are coolant leaks	See table X10 ENGINE COOLANT LEAKS
3	BUBBLING CHECK	All OK	Problems met	Operation
	Check that there are no bubbles or oil in the coolant reservoir	Continue to Step 4	Presence of fluid bubbling: cylinder head gasket damaged	Replace the seal Op. 1010C10
4	CYLINDER HEAD HYDRAULIC SEAL CHECK	All OK	Problems met	Operation
	Check the hydraulic seal of the cylinder head	Continue to Step 5	Seal ineffective	Replace the cylinder head Op. 1016C24
5	ENGINE MONOBLOC HYDRAULIC SEAL CHECK	All OK	Problems met	Operation
	Check the hydraulic seal of the engine monobloc	Continue to Step 6	Seal ineffective	Replace engine block Op. 1011A10
6	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'

1.9 JTD 16V

The coolant consumption is high (it needs topping up frequently)

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	First visually inspect the cooling system to check that there are no coolant leaks.	Continue to Step 1	There are leaks	Continue as instructed in the Table See table X10 ENGINE COOLANT LEAKS
1	COOLING SYSTEM LEAKAGE CHECK	All OK	Problems met	Operation
	Connect the test equipment replacing the expansion tank cap, pressurize the system to a value of slightly below 1.4 bar and check that the pressure remains at the recommended value for a few minutes and that there are no visible leaks.	Continue to Step 3	Fall in pressure detected with no visible leaks	Continue to Step 2
		Continue to Step 3	Fall in pressure detected with visible leaks	Continue as instructed in the Table See table X10 ENGINE COOLANT LEAKS
2	CHECKING CYLINDER HEAD	All OK	Problems met	Operation
	Remove the head. Check: That the planarity of the cylinder head plane is correct That the planarity of the cylinder head support surface on the cylinder block is correct;	Continue to Step 3	Cylinder head plane defective	Regrind the cylinder head plane
			Cylinder block/crankcase plane defective	Regrind the cylinder block/crankcase plane
			Planes correct, head gasket faulty	Replace the cylinder head gasket
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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