125000723 - 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 and let it slowly reach operating temperature. To identify the leak, if necessary, carry out a leak test on the system Op.    Op. 0510C30 COOLING SYSTEM - TIGHTNESS TESTEnd of diagnosisLeak 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 5
Leak from the thermostat unitContinue to Step 4
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
Leak not locatedContinue to Step 1
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
3.2 V6Check the condition of the radiatorContinue to Step 3Radiator damaged or distortedReplace the radiator Op. 1088B24
1.9 JTD 16V2.0 JTSCheck the condition of the radiatorContinue to Step 3Radiator damaged or distortedReaplce the radiator Op.    Op. 1088B20 ENGINE COOLING RADIATOR - R + R
3EXPANSION TANK CHECKAll OKProblems metOperation

Visually inspect:

  • The condition of the expansion tank;
The seal of the plugCheck the condition of the breather valve cap		Continue to Step 4Tank damaged or distortedReplace the tank Op.    Op. 1088B10 ENGINE COOLING TANK - R + Ror cap
4THERMOSTAT UNIT CHECKAll OKProblems metOperation

Visually inspect:

  • The condition of the thermostat unit;
  • The seal of the gaskets
Continue to Step 5Thermostat group faultyReplace the thermostat unit or the seals Op.    Op. 1088C40 THERMOSTAT- R + R
5CHECK ON WATER PUMPAll OKProblems metOperation
3.2 V6

Visually inspect:

  • The condition of the water pump;
  • The seal of the gaskets
Continue to Step 6Water pump faultyReplace the water pump or the gaskets Op. 1088C12
1.9 JTD 16V2.0 JTS

Visually inspect:

  • The condition of the water pump;
  • The seal of the gaskets
Continue to Step 6Water pump faultyReplace the water pump or the gaskets Op.    Op. 1088C10 WATER PUMP - R + R
6CYLINDER HEAD GASKETS CHECKAll OKProblems metOperation
3.2 V6

Check:

  • That the cylinder head tightening is correct;
  • The gasket seal
Continue to Step 7Cylinder head tightening not correctRestore the correct tightening
Gasket damagedReplace the seal Op. 1016D11
2.0 JTS

Check:

  • That the cylinder head tightening is correct;
  • The gasket seal
Continue to Step 7Cylinder head tightening not correctRestore the correct tightening
Gasket damagedReplace the seal Op.    Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
1.9 JTD 16V

Check:

  • That the cylinder head tightening is correct
  • The gasket seal
Continue to Step 7Cylinder head tightening not correctRestore the correct tightening
Gasket damagedReplace the seal Op. 1016B10
7HEATER RADIATOR CHECKAll OKProblems metOperation
3.2 V6Check the condition of the heater radiatorContinue to Step 8Heater radiator damaged or distortedReaplce the radiator Op. 5040C54
1.9 JTD 16V2.0 JTSCheck the condition of the heater radiatorContinue to Step 8Heater radiator damaged or distortedReaplce the radiator Op.    Op. 5040C50 AIR CONDITIONER HEATER RADIATOR - R+R
8CYLINDER BLOCK/CRANKCASE PLANE CHECKAll OKProblems metOperation
3.2 V6Remove the cylinder heads Op. 1016D11.

Check that there are no:

  • oily deposits on the valves;
  • defects in the cylinder block/crankcase surface;
  • 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 heads Op.    Op. 1016E26 CYLINDER HEADS - OVERHAUL
1.9 JTD 16V2.0 JTSRemove the cylinder head Op.    Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL.

Check that there are no:

  • oily deposits on the valves;
  • defects in the cylinder block/crankcase surface;
  • 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.    Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
9CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.