godcha

I have bought my C class C200 a year ago and the AC is not cool enough on level 1~3 and even on 4-5.. (Is that normal?? or typical C200 problem?) Even my GF car VW 2010 Golf's AC is cooler on level 1...
So I am trying to find the low pressure port for my 2017 C class C200 (W205) in order to refill AC Gas but not sure which one it is. It does not indicates with 'L' or 'H' on the cap.
Any one can help?

Also is it worth it to use AC Gas refill R134A rather than go to the garage??

Plutoe

Look for the blue cap!

godcha

There is no blue cap unfortunately. They are one small and bigger cap in black. Small cap with the number "7' and bigger cap with the number "11'.