Okay so I'm on a road trip from the Los Angeles area to Montana. I'm on the return trip and we are hitting national parks. Just saw the Grand Canyon which was awesome. Before I left home I had my ac compressor converted to r134 and made the necessary changes to the system. The first two days of the trip the ac blew nice and cold ~31 degrees. However on the 3rd day of the trip it stopped blowing. So cold. Not sure what the issue is. I bought anothrt can of 134 thinking the system had a leak but it's reading that it's fully charged. Any suggestions on where to start checking for problems?