I purchased a 54 plate Mondeo GHIA TDCI 115 last October and so far hasn't been a bad car, averaging a good 56mpg up to 66mpg on some journeys. Since I bought it however there has been a strange noise. Let me try and explain. When you rev the engine and let it come down to idle there is a weird almost sc***ing metallic noise coming from the front of the car. It has been into the garage a few times as I am concerned that it sounds almost like the gearbox but the garage assures me it isn't. They have said that it is the air rushing into the inter-cooler making the noise? Yesterday the hose from the inter-cooler to the EGR valve has split causing me a loss in power and a gushing noise when accelerating. The MPG has plummeted as well and is now doing a lousy 44mpg! The car has done nearly 150k, could this be a sign of things starting to go or should I not be worried about it? The garage is replacing the hose next week but the sc***ing noise is still there? Any help would be appreciated.

Cheers, Neil.