She's still in the 80s where turning the AC on lost 20% of your horsepower. I have explained about clutches, but...

March 21, 2026 - 17:57 UTC

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My friend had an old truck like that. He labeled the “off” side of his AC switch as “BOOST!”
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Not as much charm as that but my Volvo 240dl had various electricals that broke & I'd just run a new line, to a big chonky metal surplus toggle switch on the dash. Folks seemed to really love it!
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For those that don't know, modern cars pulse the compressor - if you're sitting idling, you can see the revs rise and fall slightly as it does (about every 10-seconds usually). Also, if you use more than about half throttle, it cuts the AC so you get all the goodness.
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