• Does refrigerant go bad?
• If I use a DVA-1 adapter to connet my gauge to a 2018 can, do I leave it on when I'm done?
• My pressures are correct but I am still getting warm air from the vents, why?
• Why does my gauge go into the red/high pressure?
• Why does the blue bezel on some of your gauges turn?
• How do I locate my low pressure port?
• Why is there a smiley face on the bottom of some of your cans?
• What about so-called "drop in" refrigerant that I see advertised on the market?
• Can I just vent the refrigerant if it is overcharged?
• Can I add R-134a directly to my R12 system?
• What should my vent temperature be?
• My A/C is blowing cold but not as cold as I would like it. Will adding additional refrigerant make the air colder?