I have a very similar issue and the plug is missing for me, do you think it is just water getting thrown up into the foam from driving in wet weather or is it something more serious?
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Coolant Leaking From Side of Car?
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If not a heater core leak there could be a hole in the floorpan letting water in. Mine was rusted through near the gas pedal and soaking the carpet when driving in the rain. Water would then leak out around the floor plug.
Either way pull the carpet to see if there is a heater core leak or a hole in the floor pan.1990 325i: slippery slope from DD/DE car to SE30/ITS
1991 318is: raw DD
2004 330i zhp: civilized daily driver
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Yep, it's the heater core. I checked and the whole drivers side is soaked with coolant.
I'm going to just block it off for now since it's summer in Florida and I just don't want to lose any more coolant. I won't need heat for 6 months or so.1988 325is - Totaled, Hit and Run
1994 530iT - Rusty, Not Running, Gone
1989 325i - Clean Body, Barely Runs
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