[n00b on demand]

i took my car out today and it was veryyyyy hot....so i switched the a/c on and i noticed that i lost some power when it was on.....someone told me once that the SVX has a different compressor for the a/c so that you dont lose gas or power when its on....when im at a stop sign and then i accelerate the car doesnt move at first but then it goes after a second...i mean it goes but doesnt go according to how much im pressing the throttle.....also loses power when climbing hills....doesnt happen all the time but it has happened a couple times.....the ac is cold sometimes and then sometimes its not that cold.....im guessing its because its Automatic that its not the same cold air all the time and it goes with the temperature its set on....in my case its at 65 which is the lowest it goes