The compressor also runs when it's above a certain temp and you select 'DE-ICE'
The design thinking is to remove the moisture from the air being blown across the windshield so it won't just fog up worse on a cool glass surface.
If you ran the defroster on the way to the show. or used a BI-LEVEL function where the air goes up and down, the compressor might have cycled.
The water dripping on the way home may have just been leftover water in the heater case.
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