What do you do with used refrigerant tanks?
Empty metal cylinders and canisters that do not contain any liquid residue and are permanently vented to the atmosphere may be disposed of as solid waste in a land fill or recycled as scrap metal where local regulations and available recycling facilities allow.
Do you add freon while the car is running?
Since your car engine is running to charge the AC system there are moving belts and pulleys,fan(s) and very hot parts. You can easily loose your fingers if you put them where they dont belong! 3. Dont release freon into the atmosphere.