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Old 01-16-2005, 08:45 PM
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Join Date: Nov 2003
Location: MA
Posts: 217
engine stop and climate control vacuum??

My 84 300SD (W126) didnt shut off with the key yesterday for the firs time (320K mi) No problem use the shut off lever then read up on debugging the system.

Without a vacuum gage/mity vac I have determined I have vacuum at the brake booster (checked a line and it pulled some vacuum on my finger). jumped to the conclusion it was the keyswitch of vacuum shut of valve at the engine. Pulled the shut off supply line near the brake resivour (brown one) with engine running sucked on it and nothing, shut key off and sucked on it again and the engine shut off. So I started it up again and pulled the climate control supply line (red and?) and shut the engine off, then I blocked the opening for the supply and the engine shut off.

So it appears I have leaks in the ACC vacuum system. which leads me to two questions.
One if I plug the ACC suply line I can shut off the car with the key, the question is will the system default to defrost mode? I figure this is acceptable in the cold till I can get the time to take apart the dash to debug the ACC vacuum. I figure I'll have to get a mity vac at the local auto parts place now, a chance to buy a new tool

Two - anyone have a W126 ACC vacuum debug procedure? I havent found one searching yet.

As usual when one thing goes wrong somthing else goes wrong as well, this had to happen when the W124 is disassembled waiting for parts!

Thanks for any help

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Old 01-16-2005, 08:53 PM
wolf_walker's Avatar
Zen And The Art Of Diesel
Join Date: Dec 2003
Location: Oklahoma City
Posts: 2,050
Go buy vac pump, pull acc panel, check the vac pods one by one from the elec valves behind it. You'll find one leaking I imagine.
One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K
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Old 01-16-2005, 09:55 PM
mplafleur's Avatar
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Join Date: Sep 2001
Location: Lathrup Village, Michigan
Posts: 2,939
Yes, default is defrost.

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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