If your GV has a (1) Webasto fitted and many Ltd editions of the 2.8 do .... and (2) you keep your fuel higher than 1/4 tank and .... (30 your heating is set to digital auto, an extra light will come on the 'highbrow' to signal its switched on automatically. This Webasto under the drivers seat area of the floor will "express" excess moisture and diesel from the 'burn bowl' - looks like loosing coolant but isn't !