Hi just a quick question. I have an N reg vauxhal combo van and recently it has started making a high pitched squealing noise when it first starts up. This noise continues for about 2 - 4 minutes or until the engine is warm. The more the revs the louder and higher pitch the noise. I have heard this noise before on other cars etc and have heard it may be the fan belt?. Can anyone confirm this or point me in another direction so I can get to the root of the problem and sort it. Any suggestions will be welcomed. Thank you very much.