Unclip the coolant tank return hose at the top right corner (facing the engine).
Remove all x18 T30 undertray screws.
Disconnect the coolant inlet hose to the intercooler (we loose the rest of the coolant so have a catch tray underneath, the alternative is taking the front bumper off to access the drain tap at the front of the radiator) then at the bottom of the right facing intercooler.
There’s a square hole in the auxiliary tensioner, using a tool rotate clockwise to compress the spring taking tension off of the auxiliary belt.
Once the spring is compressed you will notice a recess in the engine where you can put a short pin in to secure the tensioner. Now you can finally work the auxiliary belt free taking note of how it’s routed for when you fit the new belt.

