The water pump on my 2.2 petrol Vectra C 2003 model was replaced by my local Vauxhall dealer at 56,000 miles due to a water leak. The first replacement was noisy - a high pitched sound when revving the engine and driving. When I complained, there was no problem in having another pump fitted at no extra charge as the new part was diagnosed as faulty. But the second new pump is noisy, too - but not as much as the first replacement - and when I queried it I was told that this sometimes happens and it's nothing to worry about. Should a new water pump be noisy - I know it's chain driven, but the original wasn't - so shouldn't a new pump be quiet?