Hey all, first time on here. So I don't know a whole lot about cars, just the basics. Yesterday I noticed after leaving school, when I put my car in reverse n started backing out I heard a weird noise from the engine, almost like when u blow up a balloon n release the air by pinching the neck of it n make it skreech out (best way I can explain, sorry lol). Noticed that it doesn't happen in the morning when it's cold out, n only will happen if my cars parked for a while in the heat. Any ideas? :/