2003 Ram 1500 Pickup - When Should Condenser Fan Run?

Should the condenser fan run whenever the A/C compressor clutch is engaged, or is it more complicated? Is there a heat sensor on the condenser or it's exit line? Trying to figure out if mine is working
properly.
thanks!
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On Sat, 19 Jun 2010 15:28:43 -0700 (PDT), Martin

Whenever the A/C is on (regardless of compressor clutch). This includes hidden modes such as defrost.
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It never cuts off, even at highway speeds?
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