I think you mean R134a? Unless you buy the oil charge can, there is no lube.

Sounds like a leak. You can sometimes see where the leak is by looking at the lines and finding an oily portion. The oil is like a mineral oil, so look for a light oil on the lines.

You can also buy the fluorescent oil and charge with that, then park in a dark place with a blacklight. Good luck!

__________________

Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT