John, thank you for responding. It is a new compressor. the old compressor had used a rubber seal that seated and sealed well in a groove. this compressor is a flat surface. I will try the refrigerant and I do have a sniffer but I am not sure how good it is.
Thanks Again,
Bryan

First time to post but very glad to have found this forum. I have a 1986 C10 that I am trying to get the original AC system working. It worked 3 to 4 years ago but someone took the evaporator out. I have flushed all of the lines and replaced the Evaproator and Dryer. After replacing all of the o-rin...