Help googlemap/navigation bluetooth kit problem

[firestarter]

hi ive got a nokia blue tooth kit in my car and my desire is paired with it. it works thru the car speakers for voice calls but nothing else (lots of echo tho) but my old phone used to give navigation over the speakers too. it would even interupt my in car cd player to give directions then continue playing cd audio. any idea ? looked in my phone settings but cant see anything
thanks

 

[firestarter]

hi again so far ive found the nokia kit i have is ck-7w and isnt a2dp apparently if i could change the device class from smart phone to phone it may work and someone has said they used defrost froyo rom after rooting it and it fixed it but ive no idea what thats all about ;-) anyone solved this at all