[ActionMaxon]

Your A/C may not be to blame. It is possible the blend door motor is not functioning properly. If this is happening, the motor will not be able to go from "hot" to "cold". Sometimes the plastic gears in them break and they just don't work right. Usually when they fail, they are stuck at one spot, or they make noises.

If you were up for it, you could remove your blend door motor and manually move the door to full cold, with the A/C running to see if you get cold air output. If you do, the motor is bad. If not, keep looking.

As far as diagnosing the suspected leak, I would clean the dye off the low side pressure port. I recommend "brake clean" which you can buy at any auto parts store. Use safety glasses. This stuff will eff your eyes up if it gets a chance. Just spray a little spritz in there with quick short bursts until you no longer see any dye. Allow the brake clean to dry, and re-install the cap (if there is dye in the cap, clean that out in the same manner to ensure you don’t trick yourself into thinking it is in fact leaking).

Then run the car with the A/C on, and engine RPM at approx. 1500-2000 for a minute or so to get your system going. Shut the engine off and look for dye at that port. If you see none, check again in a week. If you still don't see any dye after a week it is most likely a left-over from when the vehicle had oil/dye injected into it.

The shrader valves in A/C systems are seldom the leak point, in my experience. Check for dye at the A/C compressor clutch, and hoses. You can also check the evap drain hose on the bulkhead. If your evaporator is leaking, there may be dye build up on that drain hose. It's usually the compressor or hose connection points where the seals fail.

Hope that wasn't too much. Just trying to be helpful. haha. GOOD LUCK!