A/C went out, ran dye with stop leak thru the system and charged it. Charge lasted about 30min. Used UV light to find leak(s) and nothing in the engine compartment. Dropped the glovebox and pulled evaporator and no die anywhere there. Compressor working fine when system was charged and pushing 52 degrees. I'm scratching my head here and any help is greatly appreicated! It's flipping hot in STL

 

welcome to the forum. If the freon is leaking at 30 min, it can be a hose. some hoses have a sleeve around the hose its self and the red die cannot be seen. Did you look at the condensor infront of the radiator for leaks. A rock hit can cause a leak on the front.