1999 E300 ventilation noise - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 07-07-2010, 02:05 PM Thread Starter
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Date registered: Dec 2009
Vehicle: 1999 E300 TD
Location: Portland, OR
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Post 1999 E300 ventilation noise

I have a 1999 E300 TD, when I run the A/C there is a noise that comes from the vents almost sounds like something is blocking the airway. Any ideas? maybe the cabin filter... also i noticed that the cold air is not so cold anymore , the a/c doesn't work as well as it used to.
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post #2 of 2 (permalink) Old 07-12-2010, 10:16 AM
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Date registered: Jul 2010
Location: Fullerton Calif
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If one of the blend flap motors has failed it won't have turned the inner flap all the way and it will make noise when the air blows past it. This will also cause less of the cold air to be directed out of the vent and allow warmer air to be blened with the cold as it exits the box. This is a little hard to diagnose because everything is mounted behind the dash, which is a lot of work to remove and replace.

Happy Wrenching!
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