312000625 - K027 ENGINE COOLANT OVERHEATING SIGNALLED BY THE INSTRUMENT

Test results
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
First, check:- the level of the coolant fluid- that there are no localized leaks- fan engagement- that there is no engine oil in the expansion tank- that the cooling radiator is not distorted or faulty- that the radiator is not dirtyMove on to Step 41. Level not correct2. Leaks detected3. Fan does not come on4. Presence of engine oil5. Radiator distorted6. Radiator dirty1. Top up level2. Move on to the step involved3. Move on to Step 14. Change the head gasket5. Replace the radiator6. Clean the radiator
1PLUG SEAL CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the seal of the expansion tank capMove on to Step 2Cap defectiveReplace the cap
2FAN OPERATION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Connect the diagnostic test equipment (Examiner or other instruments) to the diagnostic socket:- Detect that there are no errors memorized- Check the fan operating cycleMove on to Step 5Operation does not conformMove on to Step 3
3ENGINE COOLING ELECTRIC CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the line between the engine management and fans is working properly    See E5020 ENGINE COOLING Move on to Step 51. Connections not correct2. Control unit fault1. Restore the correct connections2. Print out the parameters detected by the control unit, then replace it    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
4FAN OPERATION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Provide the fans with a direct power supply and check their operation    See E5020 ENGINE COOLING Move on to Step 5Fan not workingReplace the fans
5CHECK INSTRUMENT PANEL OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check the consistency between the control unit and instrument panelMove on to Step 6Readings inconsistentRestore the correct connections with the instrument panel and replace it, if necessary    Op. 5560B10 CONTROL PANEL - R+R
6THERMOSTAT OPERATION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the thermostat is working properlyMove on to Step 7Thermostat not workingBleed the cooling system. If the problem persists, replace the thermostat
7WATER PUMP CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the water pump is working properlyMove on to Step 8Pump faultyRestore the correct operation of the pump. If necessary, replace it
8COOLING SYSTEM LEAKAGE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the seal of the cooling systemMove on to Step 10Coolant leaks foundMove on to Step 9
9HEAD HYDRAULIC SEAL CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the hydraulic seal of the cylinder headMove on to Step 10Seal not efficientReplace the head
10MONOBLOC HYDRAULIC SEAL CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the hydraulic seal of the monoblocEnd of diagnosisSeal not efficientReplace the monobloc