Climate control not cooling
- Make
- Alfa Romeo
- Model
- 147 Factory Service Manual
- Year
- 2000–2004
- Section
- Climate control › Climate control not cooling
Fault diagnosisClimate control not cooling
CLIMATE CONTROL NOT COOLING
The fan works properly and sends air into the interior compartment in accordance with set flow patterns, but this air remains at the external temperature and is not cooled.
Cooling circuit activation enablement is controlled by the climate control and engine management control units. So if the air conditioning does not cool under particular conditions, this is correct.
| 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 | |
| Deteriorated belt. | Replace the belt Op. 1092G10 | |||
| 1 | CHECKING WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
Connect the diagnostic equipment (Examiner) to the diagnostic socket. Check that there are no faults in the engine management control unit Check that there are no faults in the climate control control unit | Continue to Step 2 | An error is detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| An error is detected in climate control unit | Continue following the instructions for the diagnostic equipment | |||
| Lack of communication with the climate control system control unit (CAN line error) | Restore connection between climate control system control unit and body computer connector See E6020 AIR CONDITIONING | |||
| 2 | ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Using the diagnostic equipment (Examiner or other instruments) carry out active diagnosis on compressor activation relay operation | Continue to Step 3 | Compressor relay faulty | Replace the relay | |
| Connections not correct | Restore the connection between engine management control unit, relay and compressor coupling as on the wiring diagram See E6021 COMPRESSOR ENGAGEMENT | |||
| 3 | CHECK COMPRESSOR ACTIVATION ELECTRICAL CIRCUIT | All OK | Problems met | Operation |
| Check the operation of the compressor electro-magnet coupling. | Continue to Step 4 | Connections not correct | Restore the connections between the climate control unit, pressure switch and control unit as on the wiring diagram See E6021 COMPRESSOR ENGAGEMENT | |
| Pressure switch defective | Replace the pressure switch Op. 5040B14 | |||
| 4 | CHECK COMPRESSOR ELECTRO-MAGNET COUPLING | All OK | Problems met | Operation |
Check, in order:
| Continue to Step 5 | Defective compressor coupling | Replace the compressor complete with coupling Op. 5040A34 | |
| 5 | CHECKING SYSTEM PRESSURE | All OK | Problems met | Operation |
| Checking system pressures: | Continue to Step 6 | High pressure does not increase or low pressure decreases too much: leaks in the circuit | Locate the leaks and restore the correct operation. | |
| High pressure continues to rise: the compressor cooling fan does not cut in | If the fault is associated with that of excessive engine heatingSee table D30 ENGINE OVERHEATING | |||
| 6 | CHECKING EVAPORATOR | All OK | Problems met | Operation |
| Check high and low pressure pipe for leaks, and condition of evaporator | Continue to Step 7 | Pipe from compressor to condenser damaged | Replace the pipe Op. 5040A50 | |
| Pipe from filter to evaporator damaged | Replace the pipe Op. 5040A64 | |||
| Evaporator dirty | Replace the evaporator Op. 5040C10 | |||
| 7 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | Fault persists | Search for the fault starting from another symptom' | ||
Parts & tools for this job For 2000 Alfa Romeo 147
- TOOLA/C manifold gauge setSearch: AC manifold gauge set
- TOOLUV leak detection kitSearch: AC UV leak detection kit
- PARTCabin filterSearch: Alfa Romeo 147 2000 cabin filter
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