Observe the following conditions prior to the A/C performance test:
1. Connect diagnosis system. Check of the fault memory (no faults in the fault memory).
2. Attach a thermometer with separate display element to the head restraint. Lay display element outwards out of passenger compartment.
3. Perform the test in a suitable workshop area with an ambient temperature above 18º C.
4. Vehicle temperature should be approximately the same as the ambient temperature in the workshop.
5. Engine must be at operating temperature (does not apply for electric vehicles).
Heat passenger compartment:
Cool down passenger compartment:
Switch on air conditioning compressor with "A/C button" at a vehicle interior temperature of 45 ºC (measured at the head restraint).
On vehicles with MAX-AC button:
On vehicles without MAX-AC button:
After 5 minutes measure both ventilation temperatures with a thermometer at the same time (fresh air grille center, left and right). The measured temperature must be ≤ 16 ºC and the difference between right and left may not be greater than 2 ºC.
If one or both temperature specifications is not reached DRAIN OFF HEATING AND AIR CONDITIONING SYSTEM. Measure amount of refrigerant drawn off.
If drawn-off quantity does not correspond to SPECIFIED FILL QUANTITY : supplement refrigerant and repeat test.
If capacity is correct, continue troubleshooting by pressure measurement.
BMW X3 Owners Manual > Vehicle battery: Charging the battery
General information
Make sure that the battery is always sufficiently
charged to guarantee that the battery
remains usable for its full service life.
The battery may need to be charged in the following
cases:
When making frequent short-distance
drives.
If the vehicle is not used for p ...