Musty odor coming from vents - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 11-03-2011, 09:42 AM Thread Starter
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Date registered: Aug 2011
Vehicle: 1986 420 SEL, 2000 ML 320
Location: Spokane, WA
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Musty odor coming from vents

My 86 420 SEL has begun emitting a musty odor from the vents just after start up. I've tried spraying mold and mildew killer directly into the intake with out success. Any ideas?
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post #2 of 2 (permalink) Old 11-05-2011, 07:03 AM
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Get underneath it and look for the drains from the heater core; they're probably plugged.
It may take a lot of disassembly under the dash to get to the case of the heater system and clean it out, and some diluted bleach poured in there will kill the mold to some extent.
Not a simple job...


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