I remember being shocked in 1980 when my own mentor, The Master, showed me how to chill automatic choke coils for diagnosing and servicing by blowing a can of R12 on them.
About a buck a can at retail, depending on where you're buying it and whether it was "on sale".
I had to work-out for myself that R12 was one of multiple Chloro-Fluoro-Carbons that the Big Shots in Montreal had recently outlawed in aerosol cans due to Ozone Hole problems. I immediately bought a compressed-air Vortex chiller for testing chokes. I never used R12 for that again.
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To be completely honest, the Vortex unit didn't work that great for chilling chokes. It worked, but took lots longer than R12.
What did I REALLY use the Vortex tube for? Putting the cold end inside my shirt, and cooling ME.