I've got one that recently popped up on the passenger side. It sounds like water is getting in where my blower motor is. If I take the car through the car wash and then after the first left turn on the way out, the motor makes weird noises (if it was running) and water drips onto the passenger side floor. Haven't had a chance to troubleshoot it yet, but I had already sealed under the battery tray once, but if this is coming in the blower box, is the water entering through the fresh air intake?

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350