125000507 - D36 ENGINE COOLANT OVERHEATING SIGNALLED BY THE INSTRUMENT / WITH VISIBLE VAPOUR VENTING

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Results of the tests
1PRELIMINARY CHECKSAll OKProblems metOperation
Check the level of the coolant.Find out from the customer whether the problem has occurred previouslyCheck the condition of the radiator. In particular, check for signs of deformation - traces of leaks - external dirt - fluid with excessive traces of rust.Continue to Step 2Level too low: the customer has never complained of the problemRestore the correct level
Level too low: repeated problemSee table See table X10 ENGINE COOLANT LEAKS
Radiator distortedReplace the radiator Op.    Op. 1088B20 ENGINE COOLING RADIATOR - R + R
Radiator dirtyClean the radiator Op. 1088A20
Radiator is leakingReplace the radiator
Liquid with excessive traces of rustClean the inside of the radiator and cooling circuit
2THERMOSTAT OPERATION CHECKAll OKProblems metOperation
Check that the thermostat is working properlyContinue to Step 3Thermostat not workingBleed the system as per standard procedure. Replace the thermostat if the problem persists
3CHECKING FAN OPERATIONAll OKProblems metOperation
Test using an ExaminerActivate the fan in active diagnosis modeIf the fan works, ensure it comes on at the required temperatureContinue to Step 4Fan not workingActivate the fan motor directly, replace if it does not work, check the following in order if it does work: specific fuses and relays on the engine bay control unit, condition of 1st speed resistor, specific wiring continuity and insulation. Check that the control unit activates the fan speed relays. If not, replace the i.e. control unit. If it does, replace the engine bay control unit
4BUBBLING CHECKAll OKProblems metOperation
With the engine running, check there is no gurgling in the coolant reservoirContinue to Step 5Presence of gurgling in the coolantReplace the cylinder head gasket Op.    Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
No gurglingCheck the condition of the coolant pump vanes
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentFault persistsSearch for the fault starting from another symptom''