Why 1998 -88 olds condenser compressor electrical parts gas filter been replaced still does not cool down meat thermometer in the air vent it only goes down to 50?

Sounds like it's under or even overcharged on freon. Get a cheap gauge, or spend about $70 on a gauge manifold set Make sure the compressor is really clutching in. You'll hear a noticable click and see the hub of the pulley start spinning if you're standing in front of the car with the hood open.