L15 Climate control unit does not heat
- Make
- Alfa Romeo
- Model
- 156 Factory Service Manual
- Year
- 1997–2002
- Section
- Climate control › L15 Climate control unit does not heat
L15 Climate control unit does not heat
The control unit operates the fan which sends air into the passenger compartment normally with the pre-set flows, but this air does not guarantee the required heating.
| Step | Test procedure | Result | Action |
|---|---|---|---|
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket
| OK | |
| An error is detected in the control unit |
End of diagnosis | ||
| Lack of dialogue with the control unit | Restore:
End of diagnosis | ||
| 2 | MIXTURE MOTOR CHECK Using the diagnostic equipment (Examiner or other instruments), carry out the active diagnosis for the mixture motor | OK | |
| Mixture motor connection faulty | End of diagnosis | ||
| Mixture motor faulty |
End of diagnosis | ||
| Mixture motor flap faulty |
End of diagnosis | ||
| 3 | HEATER PIPE CHECK Check the efficiency and the seal of the supply and return pipes from the heater; with the engine hot, the pipes should be hot | OK | |
| Pipes not connected |
End of diagnosis | ||
| Pipes dirty or obstructed |
End of diagnosis | ||
| 4 | HEATER RADIATOR CHECK Check the seal of the heater radiator | OK | |
| Pipes not connected |
End of diagnosis | ||
| Radiator dirty or obstructed |
End of diagnosis | ||
| 6 | CHECK CORRECT OPERATION Check that the fault is no longer present | OK | End of diagnosis |
| Fault persists | Incorrect selection of diagnostic procedure |
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