Air Conditioning problem
2005 BMW X5 6 cyl Automatic 63000 miles
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No cool air coming out of vent.

the compressor clutch engages when the ac is on than stops and start again

The A/C issue you have is possibly caused by the refrigerant level being too low. There is also the possibility there is something wrong with the compressor. Reading out the high and low side pressures will be the next thing to do, also include the ambient temperature and humidity as they are important in the diagnostic process. Repost with your findings.