The a/c on my '81 300TDt has a strange (to me) problem. I drive the car every day to work and around town maybe 60 miles a day and the a/c works fine. About three months ago I took a trip of about 350 miles and just over half way the a/c stopped working, I though it had gone out but the next day it was working again and has been fine up until Friday. I took another road trip and about 200 miles from home- - same problem no cooling. After sitting for two days it is cooling again but I need to find the problem. The system was converted to r134a by the previous owner and I don't know the quality of the job that was done, but it has cooled pretty well in the year I have had it--only problem is on an extended trip on a hot day. If anyone has any idea of the problem it would be really appreciated.
Thanks
Jeff

1981 300TDt -- 207,000mi