Ultraman

I found the windshield fluid disappeared so fast in the reservoir. I did not use any of the fluid in the last few weeks.

I have to refill almost a 4L fluid to the car.

I did not see any fluid sitting on the ground so I was pretty sure it was not leaking.

This happened to my C207 couple years ago.

Any clues?

teksurv

Silly question, was the cap secure to the reservoir?

Ultraman

Of course.