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Old 05-26-2003, 11:15 AM
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Join Date: Aug 2000
Location: Austin, TX
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Has anyone tried this?

The center vent on my '91 300E isn't working properly. The air comes out the defroster. I know this is a common problem ect. My question is, has anyone done the and could you walk me through it? Does the dash have to come out?

It's gettin' hot down here in Texas and I'd like the A/C to function properly.

Thanks,
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  #2  
Old 05-26-2003, 05:41 PM
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Join Date: Mar 2000
Location: Gainesville FL
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The first thing to do is to verify where your leak is. When you are wanting the center duct, three things are happening. The defrost is being held closed the diverter flap is applied and the center duct is applied. A leak in any one will send the others to the rest positions.

MB says to remove the heat exchanger to change the center duct; we need to charge more I can see! I don't do assembly work any more and can't say exactly how my guys do it. I think they disassemble the vacuum element and do some laproscopy on it.

BTW to remove the heat exchanger (83-622) the fourth step is to remove the dash (68-100)
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