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#1
08-05-2009, 10:06 AM
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Center vents not working? It's the leaky VCV.
I decided to look at why my center vents aren't opening.
The vacuum pod holds vacuum and actuates when I apply vacuum to the #6 line on the climate vacuum control manifold. I measured the vacuum going to the manifold and it was only 4 inches. THe pod need 5-6 before it starts opening. Diagnosing vacuum in the engine I found that if I disconnect the line to the vacuum control valve on the side of the IP and plug the line, vacuum goes up to 25 inches. What part is replaceable? Do I have to replace the whole unit or what?
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) 
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#2
08-05-2009, 10:12 AM
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This is a junkyard item for sure. I think its like $200 new
 You can open it up by taking the side off, I forget what actually seals it. I tried the same thing and just got one from a yard car. The internal spring may also be broken, leaving the valve open all the time. Water gets in there and they rust out completely. dd
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------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car
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#3
08-05-2009, 10:39 AM
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I can't remember the site now, I think it was like w124performance.com? In the images section there was one of these taken apart. It was one of our member's sites.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#4
08-05-2009, 01:27 PM
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Quote:
__________________
Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba)
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