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Old 06-22-2007, 06:22 AM
Registered User
Join Date: Jun 2007
Location: Europe, Hungary
Posts: 8
help with W124 300D Turbo "clogged" air vents, please

Hi guys,
I am from Europe, Hungary, so English is not my native tounge, so bear with me, please!

I have stumbled upon this great site and forums when surfing the net for Mercedes parts a while ago! I have to say this site is awesome! The great expertise and wisdom contained here, and in the DIYs, allowed me - a hopeless guy when it comes to mechanical skill - to do repairs myself I would never imagined before that I am capable of! And I gotta tell you, it has given me a great deal of satisfaction (for being able to do it and for saving a lot of money)! So thank you to all the guys running this great site and all the ones contributing!

Enough of this rambling, I get to the point:

I've recently acquired a US spec 1987 W124 300D Turbo.
The engine and the transmission are flawless, but the rest is bust. Both interior and exterior. I already repaired a lot of stuff, but I got to a point when I have to ask, as I haven't found anything concerning this specific problem.

Majority of the air/AC/heat vents are not working! The heat and AC itself both run, but only the winshield and the driver's side vents are functioning! The double one in the middle, the passenger side one, and both of the lower, leg vents are non-functional, no matter how i set the controls!

Could you give me advice about what could cause this and how to repair, and how long should this project take to carry out? I guess I would have to remove the dashboard (my problems start here…) and the middle console to start with, and no idea what else...

Thank you in advance, your help will be appreciated!!!

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Old 06-22-2007, 12:34 PM
Registered User
Join Date: Dec 2005
Location: Portland
Posts: 191
If you remove the glovebox there is a vacuum manifold of sorts. Test the different lines with a mityvac or similar and see if you can actuate the vents and if these lines hold vacuum. If you have leaks that will be one reason the vents aren't working. This thread has all the information you need.
1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update
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Old 06-25-2007, 09:51 AM
Registered User
Join Date: Jun 2007
Location: Europe, Hungary
Posts: 8
Wow, aersloat
thanks a lot!!!
1977 W123 200D - the slowest car I've ever driven, 500k+ miles when sold
1992 W124 250D - 257k miles when sold
2002 VW Polo 1.4 - 100k miles when sold
1987 W124 300D Turbo - 320k miles
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Old 06-25-2007, 10:05 AM
NC Benz's Avatar
Certified Thread Highjack
Join Date: May 2007
Location: Fuquay-Varina, NC
Posts: 485
Originally Posted by Gabesz View Post
Wow, aersloat
thanks a lot!!!

Welcome to the forums!

NC Benz
Fuquay-Varina, NC
1979 300D
1983 300D Turbo 260,000 Miles
1984 300D Turbo 345,000 Miles (sons car)
OBK #31
1998 Ford Expedition 5.4l (fer Haulin'!) 145,000
1973 19' SeaRay with 115 Mercury TOWER OF POWER!
Club Car Golf Cart 36V
Ex toys:
1967 Mustang 289 (First Car)
Fiat 124TC
1975 Honda CVCC
1980 Audi 5000 Turbo
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