3233025 - D37 ENGINE COOLANT OVERHEATING SIGNALLED BY THE INSTRUMENT / WITHOUT VISIBLE VAPOUR VENTING

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Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Preliminarily check:

  • the coolant level
  • that there are no leaks
  • that there is no engine oil in the expansion tank
  • that the cooling radiator is not distorted or faulty
  • that the radiator is not dirty / blocked
 Continue to Step 1 Level not correctTop up level
Leaks detectedMove on to the step concerned
Engine oil presentReplace the cylinder head gasket
Radiator distortedReaplce the radiator
Radiatoar dirty/blocked Clean/wash the radiator Op. 1088A20
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Connect the diagnostic equipment to the diagnostic socket and check:

  • that there are no control unit errors at the CAN
 Continue to Step 2 There are errors in the control unit(s) Carry out the specific test for the faulty control unit and continue following the instructions for the diagnostic equipment
2CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Keeping the diagnostic equipment connected to the diagnostic socket:

  • Carry out active diagnosis of fan
  • Check the fan operating cycle
 Continue to Step 5 Operation inconsistent Continue to Step 3
3ENGINE COOLING ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation
Check that the fan control/power line is working properly See   E5020  ENGINE COOLING Continue to Step 4 Connections not correct Restore the connections See   E5020  ENGINE COOLING
4FAN OPERATION CHECKAll OKProblems metOperation
Supply the fan directly and check its operation See   E5020  ENGINE COOLING Continue to Step 5 Fan not working Replace the fan Op.   1088E10 
5COOLANT TEMPERATURE SENSOR CHECKAll OKProblems metOperation
Check that the sensor is working properly by carrying out the test See Test   1056BC  Check intake air temperature sensor operation Continue to Step 6 Sensor faulty Replace sensor. Op.   1056B50 
6THERMOSTAT OPERATION CHECKAll OKProblems metOperation
Bleed the cooling system.Check that the thermostat is working properly Continue to Step 7 Thermostat not working Replace the thermostat Op. 1088C30
7CHECK ON WATER PUMPAll OKProblems metOperation
Check that the water pump is working properly Continue to Step 8 Pump faulty Replace the pump Op.   1088C10 
8COOLING SYSTEM LEAKAGE CHECKAll OKProblems metOperation
Carry out the cooling system leak test Op.   0510C30  Continue to Step 11 No seal with visible leaksEliminate the leaks
No seal without visible leaks Continue to Step 9
9HEAD HYDRAULIC LEAKAGE TESTAll OKProblems metOperation
Check the hydraulic seal of the cylinder head Op. 1016E04 Continue to Step 10 Seal ineffectiveRenew the seal, if necessary replace the head
10MONOBLOCK HYDRAULIC SEAL TESTAll OKProblems metOperation
Check the hydraulic seal of the monobloc Continue to Step 11 Seal ineffectiveRenew the seal, if necessary replace the engine block
11CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present.End of diagnosisFault persists