On my MY late 2022 PlusFour I had a slight coolant leak (on the garagefloor) one year ago, with was a problem with the connection of a hose to the Swirlpot. They (the dealer) checked it afterwards with pressurizing the system overnight, then everything fine. Just recently, 1 month ago at my 24 month service check, the dealer did notice a leak at the radiator, while I had no complaints and couldn't spot any coolant on my garage floor. The radiator was replaced by a new upgraded/updated one, from another supplier I am told. So the cooling system is something special at the PlusFour so I would avoid unnecessary restrictions of expansion!
