Hi can any one help me, I've just bought a 2003 2.2 dti sxi vectra and when I start the engine there is a fan belt sort of squeeling. This last for around 10 seconds then stops but sometimes squeels again when steering to set off driving. It happens mailny when cold but sometimes does it when warmed up as well. I've heard of a part on vectras which sends air or gas to the cat on cold starts and this sometimes makes a noise. Any help would be great. Thanks