BMW Repair: bmw air conditioning system, bmw 528e, older models

Question
HI PAUL,I WAS WONDERING IF YOU COULD TELL ME WHERE IS THE LOW SIDE PORT ON THE AIR CONDITIONING SYSTEM IS SO I CAN CHARGE IT. THIS IS FOR A 1987 BMW 528E,YOUR HELP WOULD BE GREATLY APRECIATED. THANK YOU,OLIVER.

Answer
The low side hose is recognized by being larger in diameter than the high side hose. each side will have a service valve that is similar to that of a tire valve. I am not 100% certain as to the location as I don't have much experience with the older models. Sorry