i have a 2006 cobalt. my car has been making a whistling sound when i am in drive but only when i am in motion. when i apply the breaks the noise goes away.... when i put it in reverse my car makes a almost quiet vacume noise but not when i apply the breaks... is this a break problem or do i need to take it in to get checked ? please help me out

my check engine light has also been on for the last 7 months. i havent taken it in professionally yet becasue when i went to autozone they check engine codes for free but the guy just told me that there was no code with it and that it shouldn't be anything so i haven't taken it in yet only cause it will cost me up to $100 just to see whats wrong with it...

thank you to whom ever can help me out

~wisconsin girl~

 

Sounds to me like you need to get your brakes done...

 

sounds to me like it might be a vacuum hose lose or broke..