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Old 12-17-2003, 06:43 PM
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jc300e jc300e is offline
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Join Date: May 2000
Location: Location: Norcross, GA
Posts: 119
my 92 400e does similar.... a muffled "thud - thud -thud" when the heater temps are used. I've also noticed that I do not have airflow from my passenger floor vent...

Could that be the vacuum attempting to open a stuck passenger floor vent flap? If so, is it accessable for easy repair?
'87 300E
'92 400E
'06 ML350
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