Greetings Ernie,

I have a '84 300SD and was getting ready to ask about the rear seat vent as well. This item was not mentioned in my owners manual, or I overlooked it six times while reviewing it. I thought heat to the back seat when it's cold outside would be a nice idea but it never gets warm going to the rear. You can however almost shut the entire flow of air to the rear with the sliding lever located on the vent housing. Anyone out there that knows more about this vent please chime in. The sequence of air flow depending on which button you push on the dash I can send you with pics if you PM me your email.

Charles

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"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan