BMW E32 air conditioning faults
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E32 air conditioning is not cooling and the compressor does not start - where do I look for the fault?
See whether the compressor pulley turns when the A/C is switched on. There is a gap between the magnetic clutch and the pulley, which must close. If the clutch clicks shut when you give it battery voltage directly, the fault is elsewhere.
What makes the E32 air conditioning engage?
Engagement is affected by the receiver drier's pressure sensors and the evaporator's freeze protection sensor. The on-board computer's temperature sensor does not affect engagement.
Why does the E32 air conditioning sometimes blow warm air after a long drive?
The small fan that blows air over the interior temperature sensor can stop, for example because of worn brushes. The system then thinks the car is hot. Check the fan, replace it if needed, clean the sensor and make sure its wire is connected.
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