Today I finally fixed the light inside the car 1982 300 SD at the instrument cluster and also removed the radio and ash tray.....when I put all back (by the way I just use sand paper on the reostat spring and like magic lights came on after 3 hours of guessing and testing a lot of wires), well now I have a lighted instrument cluster and I can see if I am in park or reverse at night and check my speed, temp, etc.
But the vacuum lock that used to work fine before the fixing of the lights is not working anymore, any body with the same problem?
Did I disconnect or break a vacuum hose pushing back something?
Any help will be greatly appreciated

Hey,
Do you have the W123 engine with the engine vacuum pump. Or the W126 engine with the electric vacuum pump?
I'm guessing you have the engine pump and you disconnected something when you were working on the cluster.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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Is any other vacuum operated facility not working correctly?
The engine shutdown is activated by a valve on the ignition assembly. Working behind the istrument cluster may have dislodged one of these lines.

Did I miss something? I thought he was refering to the door locks.
Those lines are restricted so theoretically you could still have brakes and the engine would still shut off with a minor leak in that area.

A quick look through FastLane showed he has the electric vacuum pump in the spare tire well.
Maybe he did disconnect something behind the instrument cluster or maybe just coincidence?

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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It’s the engine Vacuum pump so it may be the w123, last night I tried the climate control and seems to work fine also the engine stops normal so it's back to the drawing board, this morning I will pull the cluster and check for a loose hose.

How can I tell if I have a W123 or 126 I am a liitle confused about this on my Haynes repair manual it says is a W123 but on the base of the spedometer it has some numbers and reads 126.542.4401

You have the W126 body. The W123 is the smaller vehicle and it does not have the "S" in the designation. I'm fairly sure all your vacuum comes from the engine driven vacuum pump on that vehicle.

Hey,
Even the door locks? His car is only 2 years older than mine otherwise it's the exact same vehicle.
Correct me if I'm wrong but I always thought the door locks were controlled by an electric vacuum pump in the spare tire wheel well.
Unless it just takes vacuum from the engine pump and holds it in that black container.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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Yep, you could be right. I thought the '86 had the pump in the trunk, but, if its on the '84, it's probably on the '82 as well. Wouldn't make any sense to just send vacuum back there for storage.

I just went to the trunk and yes there is a electric vacuum pump also I check the wires and they have not power, I also look for a fuse to this vacuum pump but unable to find one and besides the door locks the heater is not working, there is no hot air, the cold is ok.

I just went to the trunk and yes there is a electric vacuum pump also I check the wires and they have not power, I also look for a fuse to this vacuum pump but unable to find one and besides the door locks the heater is not working, there is no hot air, the cold is ok.
Any suggestions?

The vacuum pump in the trunk runs the door locks.
You will only have power during the process that they are cycling i.e. when you turn the key in the drivers door lock and it turns on to lock the doors or unlock them.

The heat issue is most priobably that you knocked a hose loose or broke a rubber connector while putting the radio back in. There is a vacuum pod that is right behind the radio that is most likely your culprit.

You can check if this is where the leak is without pulling the radio and ashtray by checking the vacuum control valves on the passenger side of the console. You need to remove the kick panel under the dash and the carpet on the passenger side to access the valves. With a MityVac you can test each circuit by plugging in and pumping up the vacuum to see if they leak.

Either project is not too bad but takes some time and patience.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique

Thank you for your advice as soon as the rain stops I will work on that.

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2000 430 ML
2005 S500
87 300 D
61 300 restoring

The easiest way i've found to troubleshoot leaks in the climate system is to attach your tester to the green line inside the engine bay and then, sitting in the car with the climate controls and switch cluster & wood above it (sunroof, antenna, etc) removed, turn the key on and turn one of the functions on on the climate system. start pumping your tester and using long needle nose pliers, start pinching off each one of the 5 lines to the 5 switchover valves. you will either get your tester to hold pressure, or leak slower if theres more than one leaking servo. If you dont find anything, repeat this with another vent selection button pushed on the climate controls untill you do. btw, with the ignition off, the green line to the climate sytem should hold pressure... this procedure is for the 123.. I assume the 126 is similar? Havent had to trace down a leak in one of them yet.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

The 126 vacuum valves are located vertically along the passenger side of the center console. Easier to get to through the passenger side carpeting than to pull all the ACC controller and stuff.

That's a good plan though for testing. Actually you can do the same thing inside the 126 where the main vacuum line attaches to all the valves. Easier to pump and see/hear things happening i.e. pods moving and flaps opening.

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique