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Message: <blockquote data-quote="ORVietVet" data-source="post: 26997" data-attributes="member: 9438">The power is supplied by of course a power supply thru relays and thermostat set ups that turn them on when temp reaches a certain point and if a/c is turned on. I would only assume that it can be controlled through the PCM and correct harnesses. there is likely a thread or two available at another forum I belong to at Tahoe/Yukon Forum. I know there are guys that do it there. You could also just hard wire them to switches and turn them on when you want. I know that a cooling system in good working order, does not need a fan when traveling at highway speed. Unless you are towing.</blockquote>