Where the water really gets in
Most common after heavy rainIt's rarely the glass
Here's the part most owners don't know: sunroofs and panoramic roofs are designed to let a little water past the glass. Drain channels and tubes in each corner carry it away under the car, until they silt up with dust, leaf litter and grit. Then the channel overflows, and the overflow goes into your cabin.
Why it shows up somewhere else
Water tracks. It runs along the headlining, down door pillars, along wiring looms — and lands nowhere near the entry point. A blocked front drain can soak a rear footwell. That's why hosing the roof at home and watching the wet spot tells you almost nothing, and why guesswork repairs keep failing.
The convertible version
On soft tops and folding hardtops the suspects shift: seals gone hard with sun and age, drain pockets behind the seats that fill with debris, a frame knocked slightly out of alignment so one corner of the roof sits proud. Fabric worn through at the fold lines is a different trade altogether: that's motor-trimming, not something we do; we stick to the seals, drains, frame and mechanism.