really need help

[ac95gsx]

so I just got my car back from the shop. I had them replace the A/C system comprssor,condensator,acumulator and expansion valve. I also had them replace the down pipe. the car was running great before it went in the shop with the exception of the A/C now my car feels like its gonna die on me when I step on the gas the revolutions won't drop down from 3k when its on idle the A/C blows cold air for 15sec then hot air for another 15 and it keeps doing this the whole time its on. and when I'm on first gear the belt on the A/C compressor squeeks real bad I have to switch gears quick to make it stop and i can feel the car wanting to die out on me. sorry I know its a lot but all this happened at the same time after i got the car back and the shop says they dont know what it could be.

 

[gsx4357]

if it was me i would take it back and have them fix it for free...and it also sounds like they didnt charge the a/c properly...i had that same problem with my 3g and turned out to be just the amount of freon was way high...had to have it recharged and worked fine