What causes a roaring noise in front passenger side of my 2004 Buick Rainier while driving

Hello there Robert.

Without actually being there in person this is going to be a 'spitball' guess at best.

I would say a good possibility, though not a definite 'it has to be this', is a front wheel bearing/hub assembly.

Check this video out (no it's not a GM) but it should give a possible clue to the noise;


Also another video gets a little more detail (nope not a GM either) but worth a viewing.

Hope this helps.