BMW 540iT, AC problem...

Hello!
I just bought a 2000 540iT w/90K miles.
My (non-dealer) mechanic cannot locate the source of an electrical problem regarding the AC and the self-leveling suspension...
All AC controls function, but power is not getting to the compressor; he can force the compressor to function by energizing directly, apparently the same with the suspension function.
There is an on-dash error message regarding the suspension, but not the AC.
Any suggestions (besides taking it to a dealer)?
Thanks in advance,
Fred in South Carolina
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wrote:

Check the low pressure switch for the AC, the system may be sufficiently discharged to cause the low pressure switch to open to protect the compressor...
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