I want to charge the a/c on my audi. Where is the charge port located? There is a fitting next to the radiator on the drivers side with a cap on it. Is this the spot?

 

Sorry A/C has never been my strong point...I think that it is one of the points you can charge and recharge the system from, but it also depends on which system it has in it...if it is the 134 type then that would more than likely be it but if it is the old freon 12 then that may not be it but that is about all I know on the subject...