83 300D center vent problem - climate control
Thread Starter
Newbie
Joined: Jan 2004
Posts: 7
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83 300D center vent problem - climate control
I have an 83 300D Turbo and the center vents are not working. I verified that the vacuum element works, and the silanoid that controls the flow of vacuum to the center vent element is working. I have tested the leads to all the silanoids and they all have about 10.5 volts running to them when the silanoid is supposed to open. All except the lead labled "3" that contols the center vent silanoid. That lead only measures about 7.5 - 8 volts. Any thoughts? I have tried a control unit that I know works, and still only get 7.5 to 8 volds on that lead.
Any help would be great ... I want to put my car back together, but not before I get my vents working.
Any help would be great ... I want to put my car back together, but not before I get my vents working.
Super Member
Joined: May 2003
Posts: 696
Likes: 4
From: Motor City
95 E320 Cabriolet, 108K
If they are anything like the center vents on my car, they only activate under high cooling demand conditions, and never during heating. Mercedes designed the ventilation system to give priority to the windows for defogging (safety first!), over passenger comfort. So what you're experiencing may be normal.
