AdBlue dilemma - C205 C220d

[Petrol Pete]

Not every ad-blu equipped car has a problem, perhaps you’re worrying unnecessarily?

Most Adblue MB cars will probably give problems with expensive fixes at some point and considering the very low mileage/infrequent use the OP states Op would be better off selling it .

 

[ALFAitalia]

No.....its manmade pi$$! Its made liquid ammonia and liquid carbon dioxide. These two materials are combined under high pressures and elevated temperatures to form ammonium carbamate, which then decomposes at much lower pressures to yield urea and water. So exactly the same effect on your lawn as real wee!

 

[Petrol Pete]

I'm gonna give it a try with a thinner hose tomorrow, see if it works :/ Otherwise I'll probably just do the same as you and ask them to drain and refill at my next service. Which they should do anyways. But if we can't syphon it out I don't know how they're going to syphon it out and I can't see any drain plugs at the bottom of that tank sooo. What do they do, drop the whole tank?

You put a laughing face emoji when you asked if MB drop the whole tank to drain it . At a guess that is probably exactly what they will do , at great expense to you . No laughing matter. I would suggest keep searching for a way to DIY before asking MB to do it.

 

[OneForTheRoad]

Hey guys it took me a while to get organised for this but just an update. I couldn't get the syphon pipe down into the adblue tank The pipe kept hitting a wall of some kind and no matter how I wiggled it around it wouldn't go further into the tank so I'm a bit stuck now lol. Any tips? I could try getting a thinner more flexible pipe but it kinda feels like there's a 90 degree bend in filler neck somewhere

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[rf065]

I'm gonna give it a try with a thinner hose tomorrow, see if it works

I've done it a few times, it can be done very easily with a thinner hose and if you rotate it as your pushing it down you can feel it eventually push past the obstruction.

 

[FreshFromTheGrave]

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Yeah I saw this, there's a doc as well to go with it but I think that tank is different cos that hose just flops right in there lol. It's a mission on this car.

 

[FreshFromTheGrave]

I've done it a few times, it can be done very easily with a thinner hose and if you rotate it as your pushing it down you can feel it eventually push past the obstruction.

I think we're getting somewhere! I feel like I was able to push past something with the thinner hose and it definitely gets wet at the end. Weirdly I still can't suction anything up (syphon is definitely working). I tried at a few depths in case I'd gone too far and hose curled up out of the liquid again but no luck. Do you remember how far the hose pushed into the tank when you did it? Mine goes in maybe half a metre, which I'd have thought was about right.

 

[ALFAitalia]

I was able to push past something with the thinner hose and it definitely gets wet at the end.

................................No?.....just me then!

 

[OneForTheRoad]

................................No?.....just me then!

Was the tip brown ?

 

[rf065]

Do you remember how far the hose pushed into the tank when you did it? Mine goes in maybe half a metre, which I'd have thought was about right.

Sounds right, when you feel it stop it's at the bottom. If you cannot get anything out it must be the hose or pump that's the problem

 

[markjay]

There is no animal pi$$ in AdBlue...although its use in a Diesel car is taking the Pi$$.

If animals were pissing AdBlue they'd die of kidney failure...............

 

[FreshFromTheGrave]

Sounds right, when you feel it stop it's at the bottom. If you cannot get anything out it must be the hose or pump that's the problem

Yeah I don't really get what's going on, syphon definitely works but it was just taking air. I'm tempted to get an endoscope so I can see what the heck is going on in that filler neck. I'll keep trying in the meantime though. Thank you though, this is all really helpful!

*unless the hose was just hitting condensation in the filler neck and never actually reached the fluid level after all.

 

[FreshFromTheGrave]

Boys and girls the saga continues. I have obtained an endoscope. The camera gets all the way down into the tank! The tank is... empty?? Once it clears the filler neck it gets into the tank and it hits this white circular plastic looking thing with a black cap. It's got drops of adblue on it but there isn't any body of liquid to be found. I'm not sure what this thing is as it doesn't look like a pump or heater.

Sooo either:

• The adblue level is wrong and it's actually mostly empty (car says it's full with 6700 miles left)
• This thing whatever it is, is raised well above the liquid level.
• The previous owner was a dumdum and did an adblue delete, making the car illegal - yay

Might just try chucking my adblue down there anyways and see what happens

 

[tode]

In view of the price of Adblue, it's worth filling it up, just to see what happens . .

Make sure everything is spotlessly clean.

 

[OneForTheRoad]

In view of the price of Adblue, it's worth filling it up, just to see what happens . .

Make sure everything is spotlessly clean.

Huh ?? I just pour it in .

Boys and girls the saga continues. I have obtained an endoscope. The camera gets all the way down into the tank! The tank is... empty?? Once it clears the filler neck it gets into the tank and it hits this white circular plastic looking thing with a black cap. It's got drops of adblue on it but there isn't any body of liquid to be found. I'm not sure what this thing is as it doesn't look like a pump or heater.

Sooo either:

• The adblue level is wrong and it's actually mostly empty (car says it's full with 6700 miles left)
• This thing whatever it is, is raised well above the liquid level.
• The previous owner was a dumdum and did an adblue delete, making the car illegal - yay

Might just try chucking my adblue down there anyways and see what happens

If you pour some in and the range goes up , consider it to be using ad blue

 

[FreshFromTheGrave]

Huh ?? I just pour it in .

If you pour some in and the range goes up , consider it to be using ad blue

Exactly, filling it up will reveal which of these things is happening. And if it does somehow get overfull, I feel confident I'll be able to extract enough to get it back to a readable level.

That pump thing is really in the way though, I can't see anyone managing to drain the full tank with it designed like this.

 

[OneForTheRoad]

Exactly, filling it up will reveal which of these things is happening. And if it does somehow get overfull, I feel confident I'll be able to extract enough to get it back to a readable level.

That pump thing is really in the way though, I can't see anyone managing to drain the full tank with it designed like this.

As said before, it'll be easy to locate a feed pipe, with it up on a 4 poster . I was lucky , the c207 tank is in the boot . I'll try a tube down the GLC neck in the morning and see how far it goes in.

 

[markjay]

...The previous owner was a dumdum and did an adblue delete, making the car illegal - yay...

If this was the case, you wouldn't have any AdBlue-related info displayed on the instrument cluster.

 

[rf065]

That pump thing is really in the way though, I can't see anyone managing to drain the full tank with it designed like this.

You can remove the rear wheel and wheel arch liner and get access to the tank to drain it, but I've always managed to pump it out by inserting a hose.

 

[FreshFromTheGrave]

If this was the case, you wouldn't have any AdBlue-related info displayed on the instrument cluster.

I'd have thought so too, or for it to say level not readable. But I did some quick research and it seems like there are some deletes that mask their presence by pretending it's still full at some plausible level.

We shall see after some experimentation