40000 sounds right for a water pump. No idea! Have you tried other forums, I might.

Update guys, noise back!

Full story here, all help appreciated!

Suffering from noise whilst driving. Problem starts after say 10 - 15 mins driving and is like a high pitched noise. Is not there at start up and only when car is in motion both forward and reverse. As it's usually after car been driven my thoughts are it is something heating up? This has been ongoing for last couple of months.

Car is just about to do 40000 miles. Serviced and MOT annually. Am 36 so not a boy racer who is hard on the brakes etc. Car gives 54 mpg at moment too so engine seems fine! Car has had all four tyres replaced in last year.

One Vauxhall mechanic suggested brakes was issue but they were closing down so couldn't carry out any work! At last MOT it was noted brake pads & discs wear showing wear but was merely advisory. So pads replaced and discs allegedly cleaned by local tyrefitter who I use regularly. Noise disappeared for 4 weeks!

Booked car back in as noise was back. Shock horror no noise in lead up to the car going in. The mechanic cleaned the discs(which I think they had forgotten to do first time, no charge) and that was that.

Noise back the very next day.

Seems to be coming from right side of vehicle but is not permanent.

Any ideas before I put it in to garage again!?

Could be a seized brake unit, as the heat builds up while driving the nose starts but will go at different road speeds due to cooloing of air. I had same sort of problem on my 4x4 ignored it for ages until the wheel Wobble started while braking from 70 down to 30. Wobble stopped when foot came off brakes. Take your car for a run stop and check, with the back of your hand each wheel in turn any wheel hotter that others will indicate somethng amiss with the brakes/bearings.