UPDATE: After the recharge it worked fine for a day and a half. I have charged it three times now with the same result. I was advised not to use the sealer stuff by a lot of folks. I am going to try the UV dye stuff to see if I can find the leak. Anyone ever used this? Also how do I put more compresser oil in the system?
With deference to the pros on here, I used the leak sealer from NAPA 2 years ago, with good results.
Anyway, if you are going to DIY, you should buy the dye kit, which comes with glasses and a UV flashlight. You will also need to add enough refrigerent to make the compressor stay on. The dye kits work well.
Once you spot your leak, your system should be evacuated before you attempt repair. It is illegal (in VA at least) to vent an AC system directly to the atmosphere.
Once repaired, your system should be thoroughly evacuated before you add any oil or refrigerent. You'll need a good vacuum pump ($100 and up).
Now it is very important to have a good set of manifold gauges. You don't want to overfill. Check the specs for your system - you should have an idea how much refrigerent to use.
Add your oil - you typically turn the can upside down for this step (but follow the directions on the can).
Begin to add your refrigerent. Shake the can well before starting, and rotate between the 12 o'clock and 3 o'clock positions every 5 seconds.
Note the ambient temperature, and match that the the pressure chart which is on the label of many cans of refrigerent. At 90 plus degrees, the low side should be no more than 50-55 psi, and the high side around 250 psi.
As many have noted DO NOT OVERFILL or turn the cans upside down. Overfilling is probably responsible for most severe AC system problems.
Finally, at 100 plus degrees, it's going to be hard to get the car like a refrigerator.
