Why does my Chevy Trailblazer not blow air?
Why does my Chevy Trailblazer not blow air? Its just a stepper motor... When it fails and you disconnect the battery it probally just looses its position and has no idea where it is, rather then have no defrost, which is a saftey issue, it just defaults to floor and defrost. Mine was working fine until I pulled the a/c control unit out... What to do if your Chevy Trailblazer heater stops working? If the heater has stopped working in your Trailblazer, this process has failed in one way or another. A word of caution: If there is no coolant...