anyone ever bought a can of 134a A/C and charged their own?

Hardest part is literally locating the low side port... which means that if you have eyes you can probably do this.

On my w208 it's pretty obvious on the driver side (black plastic cap on metal tube)... I would suggest that you figure out first if you indeed NEED a recharge and most importantly why. If you don't need it, you will probably do more harm than good, and if you do need it is probably because of a leak somewhere.
Did you run the AC diag and make sure you were low in refrigerant?

If you run the AC diag it will tell you exactly how much gas you have, then you can decide whether or not to try and find the leak. At least you know if it's that, or a bad sensor or what...



