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I have a 1990 300E with the center HVAC vents not blowing air. I have heard this is a nightmare involving pulling the entire dash, any suggestions? oh and what is involved in the headlight upgrade?
 

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headlight upgrade

Angela,
Get a copy of the MB Owners Bible by Bentley ($39.95 + tax). In it there is a section with several pages devoted to changing out the old candles for some new ones. Re the AC problem, could be a vacuum problem but I'm a bit new to the breed also so just a guess.
 

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Center vents not working

If the center vents are not working, and the a/c comes through the defogger vents for the windshield, your hvac systom is in default mode. There is a vacuum leak. To find out if any of the vacuum pods have a tear in their diaphragms, test the vac hoses with a vac meter. It should be on the left when you remove the glove box lining. P.
 
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