Hello all,

Sorry to ask this so redundant question, but I am a bit confused. I did some searching and it seems my center vent intermitent issue is potentially due to a faulty vacuum pod/line. I am going to remove the glove box and test the lines with a mity vac, but I need a little guidance on how exactly to do that.

Could someone provide some insight? I assume I hook the mity vac to the line , but do I create positive or negative pressure? Also, how much?


Thanks so much.

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86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

It all works on suction grasshoppa.......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

I am having similar issues w/ an 83 sd. Where exactly is the pod for the center vent located. I have seen several of them in the center console but I am not sure which it is?

paulc66t,

I will let you what I find as I work through this issue. I may even take pictures this time.

One other quick question; is it the actual hose that fails or the connection? I think it is the connection, but I am not sure.

Finally, do I have to pull the dash to fix this? again I am a bit fuzzy about all of this and I do appreciate your patience.

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86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

I think it's usually the diaphram inside the pod.

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1982 300CD Petrol/Black Leather

The whole vac system works on vacuum, so negative pressure.

First pull the glove box out. There are 6 plastic tabs that hold it in. You have to pry the center part of the tab out, the the other part will pop out. Pull out and disconnect the light, and out comes the box.

Then you will have to pull the vac line off the pod that is behind the center vent and hook the mity vac up to it. Give you mity vac a few pump. The pod should actuate and hold vacuum. If not then it's bad. There is a rubber diaphragm inside that is usually the culprit and it can be replaced a lot cheaper than buying a whole new pod. I was able to replace all the diaphragm in my ACC system for the price of one new pod.

Some poeple say they have been able to remove the pod without removing the dash. But I removed the dash and rebuilt all of the pods so I wouldn't have to worry about any of the other ones going bad.

__________________

The archives are loaded with info on this problem, WITH pics. A little searching will payoff for you...

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Thanks Jimmy, I did search, but I cannot find anything for the W126 that is specific enough to help me. I did find out about the vacuum pod and the fix so at least we are ahead of the game there.

I hope y'all will forgive me but I am new to the MB Diesel world. Call me crazy, but I really like to understand what I am doing before I just pull stuff apart. What's worse is that I do not understand the MB terminology; that makes it tougher for me to search effectively. I do like the searching via google; it made it easier to find stuff (thanks HitmanX!).

That being said I just pulled the glove box, and I do not see a hose readily accessible. I read on here that it may be approached from the driver's side.

If someone could point me to a thread with a little meat that may help too. If you do, let me know how you searched. I really want to get better at that so I don't post redundant issues.

Thanks again.

__________________
86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

Oh, and more fun; the little rubber screws that screw into the square holders on the side of the glove box both snapped (they look like stoppers to me). Do they sell those on this site? If so, how do I find them? I looked under glove box and body trim, but again I am not sure of the terminology.

__________________
86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

Also, if you have the right size/shape defect in the diaphram, a quick hard suction can show your diaphram as good, while a slow suck might not let you build vacuum. My door actuator was doing that and it appeared good unless you tested it slowly. Just something to keep in mind.

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1982 300CD Petrol/Black Leather

Not to be a PITA, but I do not see a vacuum line anywhere on the passenger side when I remove the glove box.

Is this maybe somewhere else on the SDL?

If it helps I can post pictures of what is there.

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86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

[QUOTE=mowoc;1562102]Thanks Jimmy, I did search, but I cannot find anything for the W126 that is specific enough to help me. I did find out about the vacuum pod and the fix so at least we are ahead of the game there.

QUOTE]

Go here to post #9 for the center vent pod on the 126:300SD Climate Control
Most of the pods on the 126 are very accessible but I will warn you up front that the center vent pod is behind the ACC controller and a bit of a bear.

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Sam

84 300SD 350K+ miles ( Blue Belle )

That was perfect, thanks!

__________________
86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

Vacuum pods can sometimes be repaired with the glue sold for repairing wetsuits and a scrap of a rubber glove. I've done it a couple of times on door-lock pods. They're still working. Steve