Hi all:
The alarm in my car started going off randomly so I pulled the passenger side carpet to unhook the factory alarm. I noticed that the passenger side floor board was wet. It looked like something was leaking from behind the dash, since the rubber pad under the glovebox and the dash on the passenger side was damp and cracking from too much moisture.

Could this be a heater core leak? If not, what could it be? I had my windshield replaced a while ago by professionals so I doubt it is that. Any help is greatly appreciated.

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1985 190E 2.3-16 Euro