Check the fanbelt tension. Open the engine lid (at the back ) and look at the engine, there'll be a belt around it like I've coloured in red.
Press the belt on the side (from left to right, not forwards and backwards) and see how much it deflects. If it's 2cm or less the belt tension is fine, if it deflects by 3cm or more then the fanbelt is a bit loose.
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