2000 Nissan Frontier Q&A

2000 Nissan Frontier Question: Air refrigerant leaked out?

The mechanic said that we would have to plug a leak because refrigerant does not wear out it leaks out. I was quoted $800.00 I haven't had them check for a leak yet. I just want to know how a closed system could leak and how much should they charge me. -
Answer 1
what exactly did the shop say was leaking? -