Workshop manual says there are 2 hivy poly belts.
Accessory drive, which drives most bits n pieces. ac, alternator, etc.
And it sits behind the cooling drive belt. Ie the fan belt.
Both are driven off the crankshaft pulley.

To get to the accessory belt, the cooling belt needs to be cut off.
Once the cooling belt if off, the accessory belt can come off and new one installed. With new tensioner (if needed).
A new cooling belt needs a special tool to refit.
Has anyone tried this without the special tool or is this a dealer job due to lack of tool?

Hi

Any stretchy fitting device will work. Halfords have them online and definitely amazon. Cost around £10

The principal is simple, just guides belt over lip.

Hope that helps