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Old 11-18-2004, 03:23 PM
AZGATOR
 
Join Date: Nov 2004
Location: Phoenix, AZ
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Question 89 300E How to get center vents working?

I just purchased an 1989 300E and I have everything working now with the exception of the center air vents in the dash. I removed the glove box and found where the vacuum hoses attached and they all are attached and look fine.
Any help would be grateful.
Thanks
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Old 11-18-2004, 03:30 PM
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You need to apply vacuum to each of the 7 lines behind the glovebox. If any won't hold vacuum, that pod is bad. Your center vent pod is probably toast - very common problem. Replacement of this $25 part takes 6-10 hours for a first timer - it's a huge job. A simple band-aid fix is to swap the vacuum lines for the center vent & diverter - switch lines #4 and #6 on the 7-port manifold. This will at least allow cool air to exit the center vents, although the airflow path through the heater box is not optimal.


For more info on the whole procedure, go to this thread:
http://www.peachparts.com/shopforum/showthread.php?t=35373

For photos of this exact job being done on my car:
http://www.meimann.com/images/mercedes/W124_dash/



Good luck!
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  #3  
Old 11-18-2004, 03:42 PM
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Join Date: Mar 2001
Location: Accokeek, MD
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For some reason I seem to recall that the center vents work only for specific functions. Possibly air only or heat only.

You might want to check idea out. If so your climate control wheel might also have to be fuctioning properly because it determines if you get hot or cool air... that is on the 300E.
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Old 11-18-2004, 04:26 PM
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Center vents should blow cool air only - never heat. You check the pod by applying vacuum to the vacuum line for that pod. If it works correctly, the problem is electrical - but that is extremely unlikely. Trust me.

:p
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Old 11-18-2004, 05:47 PM
AZGATOR
 
Join Date: Nov 2004
Location: Phoenix, AZ
Posts: 7
I tried switching lines #4 and #6 on the 7-port manifold and still did not get anything to come out of the center. I also tried all settings/switches on the panel. It seems like I am getting ac through the defrost on most settings and do not think it should be on all the time.
Thanks
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Old 11-18-2004, 06:04 PM
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Hmmm. It's time for more troubleshooting then. Check if you have vacuum present at the inlet to the 7-port manifold, the line that comes from the engine compartment. If there is no vacuum, find the disconnected or broken line and fix it. If you DO get vacuum there (with the engine running), the problem is probably electrical. The default position of the flaps is full defrost, as a safety feature. The defrost flaps should close completely when the ACC is set to full cold, and the center vents should open. On full heat the center vents close, the defrost vents open partially, and the footwell vents open. The factory climate control service manual actually has some very good diagrams and troubleshooting information - you might want to read up on that. (If you don't have the factory manual, drop me an email or PM.)

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