Every blue moon I can get in my car and start it, and the AC does not blow cold at all. What i mean is it is basically outside temp. What is weird is I can kill the engine start it right up and presto cold ac. Only has happened maybe 5 times in the life of the car, but afraid its gonna crap out on me in the middle of Houston summer heat one day.

Anybody know what the hell could be causing that?

Also since we are on the subject of AC what is the best way to recharge the AC on the LT1? I still have cold AC, but it could be colder. Any way to make it colder?