ac recharge?

Low side is the larger hose, recharge fitting will only fit on the low side the ports are different sizes.

These video will help you

https://youtu.be/ON2dYcmXIAw

and

https://youtu.be/uZrQCGwXfek

Please run down these guides and report back.

Air Conditioning problem V8 Front Wheel Drive Automatic

Where is the low port on a 96 buick regal for the air conditioning unit

It is located on the accumulator near the fire wall on the passengers side.

Here is a guide that will help you find it.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

and

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Please let me know if you need anything else to get the problem fixed.

Best, Ken

I have a Buick Regal 1983 2 door coupe with a 3.8 liter carburated engine, 130,000 miles. I need information on the vacuum locations in the engine compartment that handle the air distribution to the ducts in the passenger compartment. I have just recharged the ac system and have good cooling but the distribution between max,normal and bi level is not there. The cooling only come out the defroster and lower air ducts. Also I changed the blower resistor,panel switch but can't seem to get high blower

There is a small vacuum line that goes through the firewall, it is usually hooked to a vacuum resevoir (round ball). High blower speed is a direct connection from switch to blower, check the wiring with a meter to be sure you are getting through from switch to fan