alright well ive had this problem for awhile and just didnt have time to get to it...but yah i recently had a problem with my belt tensioner assembly, squeeking noise so i changed it...after i changed it, when i turn on the a/c the belt tends to wobble a crapload...so i switch back the old belt tensioner assembly and i have tried 2 other new ones and its all the same thing...now i havent tried a new belt which i might try today...but yah when i start my car go in reverse it wobbles alot, you can hear it...and when you are at a full stop and you step on the gas the wobbling noise appears a little but when you begin to drive its gone...the noise isnt there also at a full stop but yah...any suggestions? someone told me it was the a/c compressor but i got a 2nd opinion and they said my a/c compressor works fine...i mean the a/c blows out cold air but i dont know...any suggestions?