Did you vacuum the system?
Did you replace the accumulator?
If not, replace the accumulator, then have the system vacuumed...then you can recharge it. To recharge it, I would suggest taking it to someone, should run about 120 bux to vacuum and charge it. But if you want to do it at home, you can buy a vacuum (prolly on eBay would be best) for about 30-40 dollars, and a gauged can of refrigerant (if R134A) for another 20-25 bucks. Follow the directions that come with each component to a "T" or you rish blowing the lines...and if you are near them, that is a trip to the E.R.
The 1990 Buick LeSabre air conditioner recharge valve can be found on top of the air conditioning compressor. The air conditioner recharge valve will have a blue top.
You may need to recharge your a/c compressor with coolant.
Buy a recharge kit and a # 134 refrigerant; follow directions. If the system is low, the compressor will not start so you will need to remove the connector on the pressure switch which is located on the dryer. The dryer is the silver cylinder on the passenger side. There are two metal prongs that you can jump across with a wire or pliers while your recharge kit is hooked up and soon the system will take a charge ;then you can plug in the low pressure switch and the system will work again.
Remove the freon from the system. Disconnect the compressor belt, then remove the lines. Unbolt the compressor and remove it. Install the new compressor, connect the lines and belt. Pull a system vacuum, then fill with new freon.
SIMPLE. Pull the rubber boot/air connector off the side of the Shock. The problem with the system is a small solenoid valve on the compressor. Easiest thing to do .................... JUNK YARD replacement
Remove the freon from the 91 Buick Regal with a reclaim machine. Remove the compressor belts and disconnect the lines. Unbolt and remove the compressor. Bolt in the new compressor, and connect the lines. Put the belt back on. Pull a system wide vacuum, then fill with new freon.
how to replace AC compressor on a 97 Buick park Ave
Purchase a recharge kit from your local auto parts store. It will come with instructions. Keep in mind if the system is low or empty, it will probably leak out again after you recharge.
Everything takes a different form of Freon. Drain the system if it has not been so prior then add R134a Freon into the coolant system.
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.
I would guess that you need a complete recharge. Sounds like the low pressure cut out switch is functioning normally to protect your system.
One can purchase replacement Buick parts from many retailers. Replacement parts can be purchased from Buick, from auto parts retailers, and from other people via the internet.