Where is the location for the relay turn signal 2007 cobalt

There is no relay !

The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.
Do you know what a BCM is ? body control module ! Do you have factory radio installed it the vehicle ? The turn signal sound comes out driver door speaker .

You won't find it because........there isn't one. The BCM (body control module) controls the flash. If you have no sound it could be a defective speaker.