You don't say if its petrol or diesel but in the past we have had Fords that use the same engines as the Fusion in both diesel and petrol versions and neither have had 3 belts. Each has had one long serpentine belt that drives the water pump, alternator, AC compressor and the power steering pump if its hydraulic or part hydraulic. Ford would not redesign the system for the Fusion.

Here is a link to the diesel kit http://www.fordpartsuk.com/shop/ford_fusion_aux_drive_belt_16d_with_ac______f_1689148_c_874.htm

And here is a link to the petrol kit (Fusion is the same as Fiesta)http://www.fordpartsuk.com/shop/ford_fiesta_125_14_aux_drive_belt__f_1004485.htm

The only explanation I can think of as to why there were 3 belts is cars without A/C and PS have shorter belts, perhaps the kit included belts for all the different permutations of spec.

Thanks everybody for your advice,i don't know much about cars and whenever i hear a noise i tend the panic and see £ signs.I think my main concern was it could be something which needed urgent attention and as i my wife mainly uses the car to ferry the kids about i dont want then using it if it turned out to be dangerous.

I will go back and see the mechanic at the garage and see if they can get to the bottom of it.

Thanks again

Countrabban