2001 eclipse air conditioning problem?

I have a 2001 mitsubishi eclipse with the 3.0 engine has about 146,000 miles on it. I don't know what its deal is but last year and the year before i noticed the air would work if i started using it as soon as i started my car if the car got warmed up the air wouldn't work until the car cooled down so it wasn't that bad cause i would just turn it on first thing when i started driving for the day. But this year its gotten worse usually on my way to work in the morning it works fine all the way here which is about 5:30 in the morning ( when its cool outside) and when i get ready to go home sometimes i get in my car and it won't even come on but like yesterday it did come on when i got in my car i used the air for probably about 15 min and then it just kicks off. When it is working tho it is nice and cold and i know it is charged cause i bought a tester and everything and it was in the average area. Now this is what it does for any of you familiar with these cars in order to turn on the air you actually push the on in that changes the blower and when you push it in the light changes colors it goes from orange to green ( green meaning the air is on) well mine like i said will come on sometimes and then when it kicks off the light will blink orange and green i am thinking it is telling me there is something wrong but i don't know what it would be. I have never noticed near as much in other cars how much drag the pump puts on the motor but this car is terrible it really puts a drag on it like if i am just going down the interstate at like 65-80 mph and i can feel the car kinda gain power then loose it really quickly as if the ac pump kicks off for about 5 sec then kicks back on. And it is a big turd power wise if the air is running. If anyone else has or had this problem plz help.