thanks guys for your info on pipe flareing.

I have a prob with a split a/c. there is no cooling or heating happening inside. when in cooling, the liquid pipe outside and where it connects to the outside unit gets very frosty. when in heating the gas pipe gets very hot , but nothing happeing inside.
Have I lost gas? Does that mean Ive lost oil aswell?

(im a sparky, but im learning) thanks

paul