Roof seal and drain leaks - damp boot, mould and wind noise
ModerateBodywork & RustOwners' Club threads on the 2006-13 C70 describe the full pattern: a mouldy jacket in a boot that looks dry, water dripping from the window-seal join when the car moves, and the car reporting a phantom roof-in-motion warning because moisture has reached the switches. Auto Express’s road test lists wind noise from the A-pillars among the cons. The club’s fix advice is unglamorous - clean and lubricate the seals every year with a proper dressing and keep the drain holes clear with an airline or long cable tie - and it is the difference between a dry car and a corroded electrics bill.
Musty boot or damp items stored in it, Visible water tracking from the door/window seal joins, Roof-open warning messages with the top closed and dry
- Pour water around each seal join while an assistant watches inside
- Open the boot and check under the liner and around the roof compartment
- Ask when the seals were last cleaned and lubricated