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Old 05-18-2004, 09:23 AM
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Join Date: Mar 2003
Location: Michigan
Posts: 10
Air Blows thru vents when accelerating e320 coupe

Just purchased a 94 e320 coupe.

When I accelerate hard my windshield has been fogging up due to air leaking out of the dash vents. This is occuring even though the temp control unit is off (air does not blow during normal driving conditions, only under hard acceleration).

Has anyone else experienced this on a w124? Is it a faulty flap or vacuum?

94 E320 Coupe
Monotone Pearl Black, 17" AMG Monoblocks, Alpine 9835, JL Audio 500/1 Amp, 10" JL Audio W7 Sub

94 E420 (SOLD)
500E swaybars, 2.82 Diff, Monotone 040 Black, 17" AMG Monoblocks
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Old 05-18-2004, 01:11 PM
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Join Date: Mar 2003
Location: Michigan
Posts: 10

What is it that is stuck open? How do I get to it?
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Old 05-19-2004, 04:35 AM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,793
I'd start with a couple of simple things - the check valve in the line from the intake manifold to the ACC system and the ACC vacuum reservoir. You should be able to check everything with a MityVac at the yellow check valve just ahead of the master cylinder. It'll have one port in front and two ports in the back.

95 S420
87 300SDL
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