Humming coming from my 01 Boxster, any suggestions on what to look for

[Gilles]

Originally Posted by Jasper7821

Did the test and it is not coming from the front, turning the wheel at speed both ways made no difference.

Jasper, regarding your driving test were you able to hold the steering wheel for a moment or so, to allow you to load the bearings?

If your wheel bearings are ok, the only other thing to check are the CV joints...

[Jasper7821]

Originally Posted by Gilles

Jasper, regarding your driving test were you able to hold the steering wheel for a moment or so, to allow you to load the bearings?

If your wheel bearings are ok, the only other thing to check are the CV joints...

I live close to the base of a mountain, so I went downhill straight from 40-70mph and jerked the wheel both directions and no difference. Then I went on a twisty road and drove a few miles fairly hard with holding the wheel steady on the curves and still no difference in sound.
So I think it’s definitely in the rear. Any way to check if it’s the CV joints. And the boots were changed a few years ago.

[Gilles]

Originally Posted by Jasper7821

I went downhill straight from 40-70mph and jerked the wheel both directions and no difference.

Jasper,

I am sorry, English is my second language, and perhaps was not very clear on my comments...

I noticed that you mentioned 'jerked the wheel' and what I meant about loading the bearing is by turning the wheel hard to one side but for a few seconds (not just momentary), similar to carving a wide turn with giant slalom skis.. this is when you can increase (and hear) the humming noise from a bearing
.