3233108 - L10 CLIMATE CONTROL NOT COOLING
The control unit operates the fan which sends air into the passenger compartment normally with the pre-set flows, but this air is at the outside temperature and is not cooled.| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
| Check the condition of the compressor drive belt | Continue to Step 1 | Tension incorrect | Replace the belt Op. 1092G10 | |
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
Connect
the diagnostic equipment (Examiner or other instruments) to the
diagnostic socket
| Continue to Step 2 | An error is detected in one of the two control units | Continue according to the instructions for the diagnostic equipment | |
| Lack of dialogue with the climate control control unit | Restore:
| |||
| 2 | COMPRESSOR ENGAGEMENT CHECK | All OK | Problems met | Operation |
| Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the operation of the compressore relay (in the engine management control unit ambient) | Continue to Step 3 | Compressore relay faulty | Check and, if necessary, replace the compressor engagement relay | |
| 4 stage pressure switch faulty | Replace the 4 stage pressure switch Op. 5040B14 | |||
| Connections not correct | Restore the connection between the climate control control unit and the compressor coupling, via the 4 stage pressure switch and the engine management control unit. ( See E6021 COMPRESSOR ENGAGEMENT ). | |||
| 3 | CHECK COMPRESSOR ELECTRO-MAGNET COUPLING | All OK | Problems met | Operation |
| Check the operation of the compressor electro-magnet coupling and, in particular, that it is correctly connected to earth | Continue to Step 4 | Compressor electro-magnet coupling malfunction | Replace the compressor Op. 5040A20 complete with electro-magnet coupling | |
| 4 | SYSTEM PRESSURE CHECK | All OK | Problems met | Operation |
| Check the system pressure: See Test 5040B Check on operation of air conditioning system (pressures) | Continue to Step 5 | High pressure does not increase or low pressure decreases too much: leaks in the circuit | Locate these leaks Op. 5040A14 , then restore the condition of the circuit | |
| High pressure continues to increase: and the compressor cooling fan does not operate. | See table D30 | |||
| 5 | CHECK CORRECT OPERATION | All OK | Problems met | Operation |
| Check that there are no reasons why the climate control control unit or the engine control unit do not enable the engagement of the cooling circuit. For more details see DESCRIPTION AND OPERATION: 5040 AIR CONDITIONING CASING AND COMPONENTS | End of diagnosis | Fault persists | Search for the fault starting from another symptom' | |