Bluetooth in Car for Samsung GS3 running android 4.1.2 on AT&T

[Peter Papoulakos]

I switched from an iPhone to a GS3 about a year ago and my only gripe with it is how Bluetooth works in the car. On my iPhone if I am listening to the radio or Sirus and initialize Siri and ask for directions Siri takes over my entire Bluetooth system and utilizes my cars Bluetooth speaker and mic and I am able to say navigate to "xxxxxx" and it picks up what I say and switches back to my radio or whatever I was listening to. On my Samsung GS3 if I use Google Now, S-Voice or any other voice assistant to get information while driving most of the time it doesn't work or I have to manually switch to the cars Bluetooth or turn it off completely because it stays on the radio and tries to pick up my dictation over what is broadcasting on Sirus or the radio. Does anyone know why it's like this or if there is a way to get it to work like my iPhone did over Bluetooth in the car? Do all android phones act the same way or is it just a Samsung thing?