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Message: <blockquote data-quote="ALBundy" data-source="post: 137759" data-attributes="member: 15">On my e34 its on/off depending on the refreigerant pressure. Mind you, the compressor doesnt run all the time, when the refrigerant pressure is high and cabin temperature has reached the desired setting, the compressor will cut off and hence the fan too! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />There are two switches that will activate the aux fan. One is directly connected to the radiator and the other is on the refrigerant piping. Hope this helps <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>