stituner

Ihave a 2001 Chevy Tahoe and recently the a/c has been causing me problems. The rear a/c works fine but when I turn on the front a/c it will only blow out cool/warm air, like only a couple degrees less then the outside temp. And being the summer and all it needs to be ice cold like it was before. The car has 122,000 miles on it also. So, I just dont know what is wrong with it because a few days ago it worked fine. what should I do to fix this problem? pm me or just leave a post.