Hello, my alternator on my 06 maxima went out so i tryed to change it myself from the bottom of the car so first i took off the little circle part i think its called the idler pulley?? and losend the tensioner on top and removed the belt then i took the bolts out that hold the ac compressor on so i could move it after all that i seen i couldnt get it out from the bottom so i had to take out the radiator to change it when i got the new alternator in and radiator back on it was time to put back the ac compressor bolts and the little pulley back on then i noticed a little gold spacer i dont know where it came from in back of the little pulley i think so i put it back together and belt on and tightend the tensioner from the top on the belt started the car and now it makes noise when the ac turns on dont knw why did i put the spacer back in the wrong spot or is the belt to lose or to tight.. please help me