A/C blowing warm

[2.8 30v]

As its getting warm I put my A/C on to low and it blow cold for about a minute then started blowing warm is this just a simple regass,I did press the valve on the pipe for a split second and there is gas in the system so I'm hopping not got enough in the system.

 

[Bradderz_1988]

If there wasnt enough gas in the system the compressor shouldnt normally not kick in (below 0.200g). It will probably just need regasing also ask them to put some dye in incase you have a minor leak as then they can trace it with a UV light.