Quote Originally Posted by 2000GrandPrixGT2000 View Post
You get to the rear speakers through the trunk, they are in the back on the top they put the sound out above the back seats
You will know if you have the bose system if it says Bose on the grills of the front 5 1/4" speakers on the doors
I would check the connections and make sure that they are connected correctly and if they are than it sounds like your speakers are on the way out

I don't know if its different in the 2000 bodies but my 99 had to replace them by removing the rear seat and the carpeted deck from inside the car, screws are on the inside... kind of complicated but only took an hour of work to replace them both... definitely need to get new ones, mine worked intermittently like you said and it was the old voice coil in the speaker shorting out.... new ones are flawless

Fresh Installed Memphis 6x9s.... roughly 100bux for the pair