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Clearly you have a leak inspect your ac compressor and hoses if you cant find it i suggest use die and trace to leak as you know ac system need to be seal 100 percent in order the function i asume you have lose nuts or crack on your hoses its easy fix.
I would replace the AC compressor cycling switch it may be sticking have seen it a number of times. The switch is located in the receiver dryer on the passenger side of the engine compartment. See picture below.
If this isn't the problem the AC compressor relay may also cause this, flip a coin.
First of all, you need to check if the belt is tight, if the electric clutch is turing on and off with the switch, and if there are bubbles in the receiver/dryer cylinder sight glass.
If you add so much freon that the pump has liquid in it, it could blow it up.
But you buy freon with a short hose and valve.
Wear eye protection and gloves.
Then you attach the can to the valve on the side with the thick hose.
There will also be a valve on the skinny side hose, but do not attach freon there. That is only for measuring with a gauge.
The open the freon valve and start the engine and AC.
If the can frosts up, you can put it in a bowl of warm water.
Watch the sight glass until the bubbles stop.
Then close the freon valve.
Turn off the engine and AC.
Disconnect freon can.
Sounds to me like you've got a stuck door. One of the doors in the air ducts isn't closing/opening all the way. Possibly stuck or possibly a vacuum leak or disconnected/broken vacuum hose. Only way to know is to pull the dash apart. Sucks but gotta be done.