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A/C Control

Hello all,
When moving the ignition switch in position 2 I always get a "clong" noise from the engine bay. I thought that it was coming from a relay, but according to the wiring diagram there is only the starter relay in that area and that one is active in position 3 only. Could this noise coming from the A/C compressor clutch? We have in South of France right now below freezing temperatures and that noise disappeared (is that normal and a protection mode?). I have no fluid in the A/C, however the fan of the A/C radiator is running all the time when ignition is put on. Is it possible that the A/C compressor of the A/C is still engaged even with no fluid inside?
Brgds
Hartwig
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