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That compressor has a high side trigger that's supposed to CLOSE the vents to recirc when you are on MAX A/C- in other words, it supplies a ground when either you go to MAX, or high side pressure reaches a certain point- like the temps are high..
Without going complicated you can run a relay off of that, and trigger your fan. So when it's on MAX the fan activates. You can't run on MAX all day, it's not healthy (no outside air) so, at idle switch it over, let fan turn on.
Otherwise, you may need some seriously messed up electronics to make it seamless- like a VSS tapped to the cruise control sensor thing under hood.
OH- you can also go off a sensor on the upper hose, when it gets to a certain temp (215?)- fan triggers.....only way you'll hit that temp is idling.
rjp
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