It cost to fix and where can I get it fix besides Massey

2008 srx Cadillac. 85k miles. Have a rattle in the speedometer dash area. Any ideas how to fix or what it is. sounds like metal on metal.

The radio will suddenly have nothing coming out of it and then all of a sudden it comes on! i can see the music change on the screen but nothing comes out?
What could be the problem

Engine speed reduce

The lateray plastic supports for the sunshade in the headliner hae coem loose. The adhesive used to hold them
in place has failed. The second and third supports came
loose.Iwas able to slip them out, and the shade still retracts, but it could wrinkle or tear any time it is used.

It come on when i first start moving the car