You should not attempt to recharge the ac system unless you are qualified to do so. There are a lot of things that can go wrong. Take it to a dealer or repair shop and have them test the system, as there may be a leak. If that's the case, recharging it would only cost you money.
Connect a freon tank and gauge to the Buick Century low side ac port. Start the car and turn the ac to high. Open the tank and allow freon to flow. Shut the tank off when the gauge reads full.
The 1994 Buick Century air conditioning low side port can be found on top of the air conditioning compressor. The low side port will be labeled as the low pressure port.
The ac recharge port is the low side port. It is on the hoses on the passenger side of the engine close to the belts.
Connect a freon gauge and freon tank to the low side ac port. With the engine running and ac on high, open the freon tank to fill the system to the full line on the gauge.
Low pressure port should be on the firewall by the fan motor What fan motor?
The AC low pressure port on a 1999 Buick Century is located on the side of the AC accumulator. This is positioned in the left, rear of the engine compartment.
Its located on the accumulator...................
Passenger side silver canister by the bulkhead
The low pressure AC port on a 2000 Buick Century is located on the accumulator. It is used to fill the system with refrigerant and to check pressure levels.
You're boned
You can go to WAL-MART and buy the recharge kit for the ac. It's very simple to do ,all the instructions are there.
it is on the passenger side of the engine compartment, and is part of the big silver accumilator.