2888423 - L55 HEATER NOT HEATING

The fan works properly and sends air into the interior compartment in accordance with the set flows, but this air does not ensure the required heating.
Results of the tests
1HEATER PIPE CHECKAll OKProblems metOperation
Check the efficiency and the seal of the supply and return pipes from the heater; with the engine hot, the pipes should be hot Continue to Step 2Pipes not connectedRestore the correct connection
Pipes dirty or obstructedClean the pipes or replace them (see assembly 5010A)
2CHECK MIXER CONTROLAll OKProblems metOperation
Check the mixer control cable is correctly fitted.Check that the mixer flap moves freely.Continue to Step 3Connection defectiveAdjust correction or change the cable Op.   5020B42 
Flap blocked or defectiveRestore the flap to working order or replace Op.   5020A24 
3HEATER RADIATOR CHECKAll OKProblems metOperation
Check the seal of the heater radiatorContinue to Step 4Pipes not connectedRestore the heater radiator pipe connections
Radiator dirty or obstructedClean the radiator or replace it Op.   5020A50 
4CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'