Thanks jcyuhn

The leak became audible on day 4 post retrofit/charge. The hissing was noticable when the AC was turned on and at low fan speed. As soon as I stopped the AC, so did the hissing. THe last 2 days of uss [day 4 and 5] the cooling ability became noticably inefficient spewing warmer air by the minute.

BTW, # 9 refers to the proper sequence of part installation in relation to actual R12 refil. For example, I presume I would not replace the dryer until the system has been completely flushed and is ready to be refilled at the AC shop.

Also wonder what parts need to be changed. The mec who put in the R143 told me he did not replace any parts. Is it possible that he use the existing connectors to load the refrigerant?

Thx for your help.

RM