There was a bit on 60 minutes (I think) a couple years ago where a fire department in the Midwest took junk cars filled them with hydrocarbon refrigerants created a leak and an ignition source and filmed it. Made an interesting display, sorta like a bit of the mideast in the midwest.

It's amazing it is still around in the US as it is definitely illegal to use in mobile A/C.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician