Hi, recently i got my oil and tran. oil change at the shop. soon after that i began to hear some odd sound coming from the bottom of my engine. it gets lounder when i put it into gear or when i turn on the AC. does any1 what that sound could be coming from? it sounds like a piece of metal is vibrating, however i couldnt see anything loose or wrong when i lift up the car. thx for any kind of input.

 

Well, for one, I wouldn't go back to that shop if I were you. Can't help with the noise though.

 

Have you ran through any bumps or dips and hit the bottom of the car?

 

hm, AC tensioner pulley loose? Its screwed into the block...bottom, front drivers side.