Renault Megane 2 litre 2004 - Noise when starting engine - Siggsy

Need some advice, I have a Renault Megane 2 litre petrol, 2004, 52,000 miles. Over the past two weeks I have notice a noise coming from the engine when starting my car in the mornings. After driving for a while it disappears.

The noise is fairly hard to describe, its a squeak/whirring noise which happens every two seconds, as mentioned it will continue to happen until the car is driven for a little while. I have had the fan belt replaced and the noise is still there. Any ideas what this could be?

Renault Megane 2 litre 2004 - Noise when starting engine - ChannelZ

When they replaced the belts, did they replace the tensioners as well?

Renault Megane 2 litre 2004 - Noise when starting engine - Siggsy

I'm not sure, they just said the fan belt was replaced. The noise seems to be coming from under the manifold.

Renault Megane 2 litre 2004 - Noise when starting engine - Avant

Moved to Technical.