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Old 04-29-2012, 11:57 AM   #1 (permalink)
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Date registered: Apr 2008
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Talking need some advise!

Hello
i wonder if somebody know why this shelf wont close ?the left one is close bbut the right one is open , im adding some photos, what is the cure ? am i in a deep shit , those are the intake of fresh air i think, for the heater motor.its sl450 1973 .
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need some advise!-photo-1.jpg   need some advise!-photo-2.jpg  

Last edited by dragon2; 04-29-2012 at 12:02 PM.
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Old 04-29-2012, 12:06 PM   #2 (permalink)
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see the first post in this thread:

http://www.benzworld.org/forums/r-c1...nyms-pics.html

Don't let the picture scare you.

The twin vacuum pods on each side close those doors. They are accessible by removing the instrument cluster and glove box. Assuming both sides are not working you probably have a vacuum leak somewhere. All the vac lines go to a block on called the switch over valve also mounted behind the glove box.
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Old 04-29-2012, 12:08 PM   #3 (permalink)
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Just looked at my 73. John is correct, both of those are vacuum operated even on our vintage. They are controlled by the rotary vacuum dial by the four levers. At very minimum a linkage or vacuum line off. Worst case a bad diaphragm on the vacuum motor. You might put a magnet on the one that doesnt move and see of it just flops, or if it seems to be hooked to a linkage.

Last edited by tdoriot; 04-29-2012 at 12:19 PM.
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Old 04-29-2012, 12:48 PM   #4 (permalink)
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Hei and thanks for the fast replay , if its vacuum operated ,and assume i have a leak ,then why one is operating and the other not?sorry for my ignorance.

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Old 04-29-2012, 01:11 PM   #5 (permalink)
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Each side has a vacuum pod like the pictures Roncallo posted of the behind the dash view. Our 73's don't have all the other control modules etc. One of the flaps could have become disconnected, the Vacuum pot could have a ruptured diaphragm or simply a rotted or hose that came off the vacuum pot, switch or a t somewhere. Does that vent move easily when you try to move it ? There are quite a few possibilities. I'd have someone move the controls as you watch the vents move. If the closed one even flutters, at least you know its attached to something.
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Old 04-29-2012, 01:30 PM   #6 (permalink)
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Originally Posted by dragon2 View Post
Hei and thanks for the fast replay , if its vacuum operated ,and assume i have a leak ,then why one is operating and the other not?sorry for my ignorance.
I thought they both weren't operating. if only one is not operating then its probably just the pod.
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Old 04-29-2012, 01:40 PM   #7 (permalink)
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It has some resistant when im pulling it up... but then it goes down again,does it has any connection to my central locking which is not working, (im just thinking vac leak).do those flap should open and close? what is the function of them?

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Old 04-29-2012, 01:41 PM   #8 (permalink)
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Thanks again
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Old 04-29-2012, 07:19 PM   #9 (permalink)
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Your original thought was correct, they bring in outside air. Rowdie just posted a link to the 107 maintenance manual to a guy that asked for it. Go to that link, punch in the 73 and look at the heating section. It has diagrams of the vacuum system. From that you should get a good idea how it all works. Glad to know the attachment wasn't rusted off or something. That was the idea behind you checking that. The fact that you pull it up with some resistance, then it goes back down indicates to me that the pod is holding vacuum on one side at least. Seems like it isn't getting vacuum to the side that holds it open. I'd check the connections at the dash switch, then work your way up. I tried to apply vacuum to my car as the vents are exposed, but I have too many lines unhooked to make the vac system work. Also, I may have an issue at my rotory switch, as it seems to want to twist in a circle instead of stopping one direction then the other. I don't think your problem is major. Be sure you clean out the drain hole while you have the covers off. Its in the lower front corner. The water fills up that area and runs over the dam into the heater box, then onto the floors. Perhaps your problem. Good luck !

Last edited by tdoriot; 04-29-2012 at 07:54 PM.
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Old 04-30-2012, 12:44 PM   #10 (permalink)
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Thank you tdoriot and roncallo sharing your knowledge with me i will try to take off the instrument cluster and see if i can fix it ,how do i check the connections at the dash switch?
im going to do it in the next week will keep you inform, got my back seats today looks very good.

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