Who Knows What Evil Lurks . . . Who Knows What Evil Lurks . . . Or, worse, ask a relative who's in the stationary HVAC business to fill 'er up with R-22. Still worse, people are blithely pumping in propane.
Nobody knows, so the contagion spreads.
It's unbelievable what kind of damage you can do to a car's air conditioning system by putting two lbs. Three out of five thought you could mix 12 and 134a. Whenever a technician discovers a refrigerant soup, he could just give the customer his condolences and send him out the door, but that doesn't fit in very well with his hard-won reputation as a person who offers helpful solutions to tough problems. He collects the stuff and sends it off to a facility that will either destroy it or reclaim it, then charges the car' s owner for that service. Perhaps sometime in the future shops will no longer need a refrigerant identifier because there'll be nothing around but pure R-134a.