• If I put in refrigerant (top off), do I need to add oil too? If so, what type and how much?
• Can I recharge my A/C system myself?
• How much refrigerant should I put in?
• Can I use your products in my hybrid vehicle?
• Do I need to vacuum out my system before charging?
• Can I add refrigerant to my vehicle when it is cold outside?
• I get two pressure readings while checking my low-side pressure, which one should I use?
• What color are the caps on the low pressure port and high pressure port?
• What is Ambient Temperature and what should my pressure readings be?
• If I use a universal gauge on a piercing valve can, can I remove the gauge before I've used the entire can without leaking the remaining refrigerant into the atmosphere?
• How to recharge with a T-handle or Gauge-Handle style recharge hose?
• There are no expiration dates on your products. Should I be concerned that the refrigerant in a piercing valve can is too old to work correctly?