you know that " OmegaBenz " could spend a whole W.E. looking for that drain you spoke of as being " Right above the tail lights " and still never find it!!
And you are " besmirching " my namesake as well as my being far too serious!

I still vote for the notion that this Coup"A" most likely has a leaky window... unless " OmegaBenz " is certain the weather seal has already been replaced or the rubber in the seal is nice and pliable! The age of this car makes it a prime candidate for the disease we call " MBZ RearWeatherSeal Sclerosis"!! See I do have sense of humor... no matter what some say!!
Best of luck on your leak " OmegaBenz "... we have just assumed there is a "Leak"... I don't remember this actually be stated... let me see... Nope, the computer says that I'm the first on this THREAD to say " leak ". That reminds me I need to take a diauretic pill for my heart... outahere!
Sam