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Q: relay switch on 2003 BMW 530i

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where is the relay switch for the a/c condenser fan located.
not too sure on the relay at this very moment but there is a pressure switch
the switch is located on the a/c pipe itself with a black plug hanging off it
forget which line is was but within the RHF area
please ensure a qualified a/c handler has evacuated the lines before replacing if faulty.
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