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Yep, vacuum pods with busted diaphragms, no doubt. Of all of the vacuum pods on the climate system (I think there are 6 of them), the defrost pods are the only ones that are in the open position by default, so that if they fail (as yours apparently have), you still get defrost airflow. Neat engineering, plus, you're finding that it's a sure-fire indicator of a failed defrost pod. As for replacing them, I've never done it, but there are folks who claim the defrosts can be replaced by only removing the glove box and reaching way up to the left to get at the little buggers. When I asked my indy about it, he claims that they require removal of the dashboard, and a bill for 8 hours of labor. How adventurous are you?
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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member
Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'
There are only 10 kinds of people in the world--those who understand binary and those who don't
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