Squeal when car comes to halt. Help appreciated!

[ChampionRabbit]

Hello!

My ancient Audi 1.8t is driving me slightly potty.

I can start and drive for 10 miles fine, but when I come to a halt, the engine squeals for about 10/15 seconds (at 0mph).

It sounds like belt squeal, but I changed the belt and tensioner and no difference.

It does it in the dry and in the wet.

It does it with the air con off, and with the air con on.

It does it with lights on, and lights off.

Because it only lasts 10/15 seconds, I can't open the bonnet and chase down the squeal.

Any ideas?

[Drogo]

Fan belt glassed?

When this happened to me a mechanic poured a small amount of screen washer fluid over it and it stop never to return.

Not saying that's the right thing to do.

[InitialDave]

Maybe give it a short drive with the belt removed, and if it doesn't do it, you've identified that it's definitely something with the accessory drive side of things.

As you've already tried a new belt, I'd check all the pulleys are clean, and that none of of them feel like there's any issues with the bearings.

[Drive it fix it repeat]

I’ve had similar symptoms when my auxiliary pulley was failing. If you can access it see if there is excessive movement. Some are constructed with a metal core then a band of rubber then a metal outer. I’ve had it twice where the rubber fails and can make a horrendous squealing.