My A/C in my 300CD workes pretty well for the 134 that is in it. Only problem I have is when I have the selector on dash vents only, I get some air out of the defroster vents by the windshield. If I could stop the leak there, I feel the A/C would be able to more than keep the car cool. I owned a 190D once that had the same problem. I removed the dash panel and discovered a broken diaphram in the selector valve that closed the defroster vents. I replaced it and it worked great. My dash in my 300CD is perfect and has no cracks in it. This is why I am hesistant to remove it. So last night I pulled my glove box compartment out to see if I could see the diaphram. I could see a diaphram in the general location that my 190D diaphram was. It appears there is about a 3"x4" opening that allows visibility. It sits pretty much in the center of the dash. Is this the diaphram that controls the center vents?

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2005 Accord Hybrid (Wifes)
1995 Subaru Impreza L AWD (Snow car)
1984 GMC Sierra 1500 (Mine)
1983 300CD Best $ I ever spent. (Mine)
1984 190D (sold and glad I did)
1983 300D (sold and wished I hadn't)

Thats the one. If you have a MityVac you can check to see if that is your leak. I had to replace mine about a year ago. I had to remove the dash, But I wanted to replace all of mine. I have heard others say they were able to do it without removing the dash.

If you have small hands and are patient you can probably get it out without the dash removal.

Also there is a website that sells the diaphrams for the pods. It cost me about $45 to replace all of them in the car. Which is about what a new pod costs.
Here is the website.
http://www.autoluxmbz.com/

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I had heard the same about the center vent, some you can and apparently in the case of my 82 CD, i couldnt, it had screws from the front side holding it in so i had no choice but to remove the dash to get to it.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Thanks gentlemen!

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2005 Accord Hybrid (Wifes)
1995 Subaru Impreza L AWD (Snow car)
1984 GMC Sierra 1500 (Mine)
1983 300CD Best $ I ever spent. (Mine)
1984 190D (sold and glad I did)
1983 300D (sold and wished I hadn't)