2398910 - X10 ENGINE COOLANT LEAKS

A leak of engine coolant is seen with dripping and/or fouling of the engine
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
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, carry out a leak test on the system Op.   0510C30  No leak locatedContinue to Step 1Leak from the pipesContinue to Step 1
Leak from the radiatorContinue to Step 2
Leak from the expansion tankContinue to Step 3
Leak from the water pumpContinue to Step 4
Leak from the thermostat unitContinue to Step 5
Leak from the cylinder headContinue to Step 6
Leak from the heater radiatorContinue to Step 7
Seepage of oil or water between the engine and the cooling circuitContinue to Step 8
1PIPES CHECKAll OKProblems metOperation

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 2Tightening not correct or components damagedRestore the correct tightening or replace the components involved
2CHECK ON RADIATORAll OKProblems metOperation
1.2 16v 1.4 16vCheck the condition of the radiatorContinue to Step 3Radiator damaged or distortedReaplce the radiator Op.   1088B20 
1.2 16v 1.4 16vCheck the condition of the radiatorContinue to Step 3Radiator damaged or distortedReaplce the radiator Op. 1088B24
3CHECK EXPANSION TANKAll OKProblems metOperation

Visually inspect:

  • the condition of the expansion tank;
  • the seal of the plug
Check the condition of the breather valve in the cap
Continue to Step 4Tank damaged or distortedReplace the tank or the cap
4CHECK ON WATER PUMPAll OKProblems metOperation
1.2 16v 1.4 16v

Visually inspect:

  • the condition of the water pump;
  • the seal of the gaskets
Continue to Step 5Water pump faultyReplace the water pump or the gaskets Op.   1088C10 
1.2 16v 1.4 16v

Visually inspect:

  • the condition of the water pump;
  • the seal of the gaskets
Continue to Step 5Water pump faultyReplace the water pump or the gaskets Op. 1088C12
5THERMOSTAT UNIT CHECKAll OKProblems metOperation

Visually inspect:

  • the condition of the thermostat unit;
  • the seal of the gaskets
Continue to Step 6Thermostat group faultyReplace the thermostat unit or the seals Op.   1088C30 
6CHECKING CYLINDER HEAD GASKETAll OKProblems metOperation

Check:

  • that the cylinder head tightening is correct
  • that the gasket is not leaking
Continue to Step 7Cylinder head tightening not correctRestore the correct tightening
Gasket damagedReplace the seal Op.   1016C10 
7HEATER RADIATOR CHECKAll OKProblems metOperation
Check the condition of the heater radiatorContinue to Step 8Heater radiator damaged or distortedReaplce the radiator Op. 5020A50
8CYLINDER BLOCK/CRANKCASE PLANE CHECKAll OKProblems metOperation
Remove the cylinder head Op.   1016C10 

That that the following are absent:

  • oily dross on the valves;
  • defects in the cylinder block/crankcase plane;
  • defects in the cylinder head gasket;
Continue to Step 9Cylinder block/crankcase plane defectiveReface the cylinder block/crankcase
Presence of oily dross on the valvesOverhaul the cylinder head Op.   1016E10 
9CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.