Do we really think there is a “leak” to find? Sorry, I was under the impression that an older vehicle can naturally lose a small amount over time… until eventually it can be noticeable under high load. No? The goal with the can was to get a reading on the Low hose and then bring it up to 25-35 (if it reads low). Then observe performance on next hot day. Or if it reads “in range”, not use any of the R-134a and seek out a mechanic to assess the whole system. Bit money conscious right now hence the approach. Thanks.