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Old 11-12-2006, 01:27 PM
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Join Date: Apr 2005
Location: Austin, TX
Posts: 631
Chasing Massive Vac Leak

Struggling with a massive vacuum leak.

I believe it's somewhere in the climate control or locking system, and I'm looking for hints to isolate those circuits individually.

I've checked vac diagrams. They show very detailed setups of the underhood components, but show only a vague line going "to other vacuum consumers". I've checked ACC and locking diagrams, but instead of referring to color coding, they simply say "ACC suction line" or "fresh air supply line".

Here's what I have entering the passenger compartment.

1) Black vent line
2) Brown/blue stripe to shutoff
3) two yellows which meet in a 3 way check valve (locks?)
4) plain brown
5) green/yellow stripe

Can anyone help me identify the functions of 3 thru 5, and offer suggestions for isolating indiviually the ACC and locking circuits?

'82 300D Petrol B-G Metallic
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Old 11-12-2006, 02:38 PM
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Join Date: Mar 2005
Location: SoCal
Posts: 654
3. solid yellow line goes directly to the reservior. Yellow w/ red stripe goes to the locking mechanism at the drivers door.
4. plain brown goes to the shutoff mechanism at the start switch, the other end is the brown w/ blue stripe that is attached to the shutoff valve to the IP
5. green w/ yellow stripe is for the ac switchover valves located behind the acc controls. It supplies vacuum to 5 s/o valves.

I would check the vacuum pods first if they hold vacuum. I havent worked on the locking mechanism on my car yet.
'85 300D Cal 280,000 miles
'07 C230 37,000 miles
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Old 03-09-2007, 06:19 PM
derherr65's Avatar
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Join Date: Jul 2006
Location: North Texas
Posts: 305
I think you have the lock and reservoir lines backwards. On mine they are:
Solid yellow = master lock switch.
yellow with black/brown/red stripe = vacuum reservoir
I suggest we solve high gas prices with environmentalists... unfortunately they don't burn well.
1982 300CD, 220K miles: This vacuum system will be the death of me yet! (OBK #26)
1977 F150 400 C6 2wd, 10.2 sec 1/8 mile with 2.75 gears.
1965 Mustang. Mostly stock... LOL!
2001 Ram 2500, cummins, 5spd, 202k miles.(girlfriends)
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