Electric motor whining noise ? Fixed !

[timf]

So I'd just come to a stop at some traffic signals and a couple of seconds later I heard what sounded like a relay click in followed by what sounded like an electric motor starting / running with an 'iffy' bearing.

I turned off the AC and any other likely sources but to no avail.
After a few 10's of seconds it went away.

It seems to be pretty repeatable but have not been able to isolate the problem - even though it's quite loud under the hood / bonnet.

The pitch / speed of the motor sounds more or less constant despite engine RPM, but does go up a little with RPM - I suspect because the battery voltage increases a bit.


EDIT - It's the electric cooling fan(s) - doh !

Sounds like a bearing might be on the way out on one of the motors...