Where is the low side service port on your 1991 Acura Legend?

The low side service port on a 1991 Acura Legend is located on the refrigerant line, typically near the firewall on the passenger side of the engine bay. It is usually a smaller port compared to the high side port and has a blue or black cap. To service the AC system, you would connect your gauge set or refrigerant canister to this port. Always ensure the engine is off and the AC system is properly diagnosed before servicing.