I don't think many here will think less of you for running AC. I'm a heat wimp, and set mine at 76. Much better than showing up at my destination soaking wet.
I had the same question about AC efficiency, so I'm glad you asked. There likely isn't a one-size fits all answer, but RedDevil's logic is sound. You're probably fine since your AC radiator is mounted low.
Not sure at what temp your fan clutch locks up, but on my car the E-fan kicks in at 212 degrees. I bet yours wouldn't fully engage until you were well into the 200s. My truck supposedly has a mechanical clutch, but it blows enormous amounts of air all the time. Perhaps it's those viscus forces you mention.
Quote:
Originally Posted by dwarfnebula
It's possible that blocking off airflow through the A/C condenser could raise high side pressures and therefor make the compressor harder to turn.
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The AC is a closed system and not subject to external pressure differences. Are you saying the high side pressure would rise due to a rise in condenser temperature?