ac evaporator

I don't remember anymore but I believe AMMONIA trumps them all. YEAH!!! Let's do THAT!!! Let's use AMMONIA in our car systems LMAO

LMAO X 2. "Lez do a flame test on dat thang fer leaks."

IIRC, oxidizing ammonia produces an explosion (see West, Texas), and oxidizing R-12 produces phosgene (see Battle of Ypres, Belgium [WW I]).