My 2022 LDV T60 Max is leaking coolant

This engine uses a separate cooling system for its intercooler set-up, rather than simply tapping into the engine’s main cooling system. But the secondary cooling system works just the same as the engine’s coolant system, which means the expansion tank also has an overflow function.

When coolant is heated, it expands. If the system is too full, there’s not enough room for this expansion of the coolant, and the overflow function steps in, allowing some of the coolant to escape to prevent over-pressurising the rest of the system. Once that has happened perhaps a couple of times, the system will then have enough room in the expansion tank to completely contain the coolant, even when it’s hot. This is possibly why you’re seeing some coolant escaping.

However, if the coolant level continues to drop, there’s a good chance you have a leak somewhere in the system. This could be contained within the plumbing that routes the coolant around the engine bay, or even a crack in the expansion tank itself. A workshop should be able to do a pressure test which will determine if there’s a leak and where it is. The leak is also often located on the valve that lets the excess coolant when it needs to (a valve that can commonly fail). This is normally at the top of the expansion tank, but the leak could easily be appearing at the bottom simply by running down the side of the tank.