[Barabus]

What a very informative thread and thanks to all who have taken time to contribute.

I find myself here from previous W140 S600 ownership then onto R129 500sl (which I still have) and now I have picked up a 2002 CL 500.

The ABC system is becoming a lot more clearer the more I read up on it and I am taking preventitive maintenance steps on the system but the horse may have already bolted I think.

I will pop back in with the symptons and may request guidance as to actually which front accumulator / air reservoir is the recommended one to change in the case of the 'noise' I am getting.

Many thanks again for this thread.

 

[Barabus]

Part id please

Regarding the quote below could anyone please advise which component is actually being referred to ? I have included, I hope, a diagram to aid identification. Is it 52a or 14 ?

Many thanks

(P/N 220-327-0215 air reservoir) is the part you need. It is found under the car towards the front center slightly closer to the passenger side.
Lift on a hoist.
Let the car suspension settle for 5 minutes before removing the old Dampner. It is advised to bleed off the suspension, but my tech didn't do it.
It is a simple wrench off/on job and should take less than 10 minutes.
Remember to top up the ABC fluid afterwards as you will have a ruptured Dampner and it will have had some fluid trapped within.
Have the dealership do it for you and it will probably be no more than 1 hr. labour after they have inspected the lines first and then changed the Accumulator/Dampner.
Good luck and let us know how things work out.

 

[Barabus]

Further info

A bit more info to my enquiry above is that I am getting all the symptoms in the quote below and have carried out the checks this member did.

I am a new comer to this forrum and appreciate the tremendous amount information on this site. I own a 2000 CL500 (my 5th mercedes).
Last week a humming noise started coming, took it to my independent service guy, the hydraulic oil was real low. He also checked the transmission and power steering oil as well. The noise is still coming at low RPM only.
The suspension works fine, level ajdustment is fine and there is no ABC light.
I have three questions from the experts:
A. Is it ABC pulsation Damper/accumulator which is causing this humming noise?
B. one of the on-line auto part store listed two different accumulators e.g. (1) Center suspension accumulator return air suspension (P/N 220-320-0415-OR) $170 the other, (2) Front suspension accumulator (P/N 220-327-0215LEMF) $123. Which of the accumulator do I need to order?
C. The schematics diagram given on this site is not very clear. Is there an explanation to where this accumulator is located and how to get to it? and is there any precuations, bleeding etc is needed?
Thanks in advance
"Life is just like Jazz, it's best when you improvise"

 

[Duhdenmark]

A bit more info to my enquiry above is that I am getting all the symptoms in the quote below and have carried out the checks this member did.

Humming voice would be the item # 52a according to lots of former treads on this subject.

If you are also experiencing loss of abc oil, I would suggest changing the # 14, there is one in the back as well, same part #. If you are paying a mechanic you might as well change the last one called the return pressure accumulator, it is located right next to the rear control block.

I have also read, that you can just unscrew them and install the new one, no real need for pre release of pressure.

After the work is done, make sure abc oil is correct level, run the car and bleed system by using the raise/lowering button until you think the system feels good. Then recheck the oil level.

David

 

[Barabus]

Thanks for your input David. I was wondering about the de pressurising of the system. I have and still occasionally do work on Rolls-Royce and Bentley vehicles and
de pressurising of the hydraulic system (its a Citroen copy) is a must especially on the mineral oil system vehicles. Will look into this further and if the air cell does not spin off with easy resistance I will prepare myself for a shower

 

[Barabus]

Job done and 'humming' gone.

Thanks to all those who take time to contribute to these technical threads. Very helpful.

 

[keyhole]

Job done and 'humming' gone.

Well done.

So what parts were actually replaced? Did you DIY?

 

[Barabus]

Well done.

So what parts were actually replaced? Did you DIY?

On the diagram I replace the part numbered 52a. Merc call it an air cell. Basically a sphere seperated by a diaphram. Suspect the diaphram weakens or possibly tears over the years making the air/gas space fill with oil. Did the trick for me ! Oh and here in the UK it cost £100 gbp

 

[slonar21]

Nice pdf about ABC error codes

http://www.benzworld.org/forums/9380705-post4.html



Mod Note: Thanks, added to sticky

 

[NRL]

When measuring the ABC fluid level, do you measure with the ABC Dipsticks pushed all the way back in pinched on? or just pushed and touching the opening to the ABC reservoir?

It's at least an 1/8 or 1/16th difference..

 

[Marsden]

For my part, I always pushed it all the way back in to measure.

 

[NITO]

GLad to hear everything worked out, please post pics of the quality work you have complete to make it easier for someone who is doing the same. Pics tell the story behind the story, good visual aid.

 

[MB Dragster]

@slonar 21, I am new to CL 600. I recently broke my ABC fluid return hose that is going to the reservoir before the filter. Can you please help me with the part number? I am new to this car and replacement procedure with some pics from WIS will help a lot (if possible).

I should also add that when I broke the ABC return hose, I was trying to remove the cooling fan in order to reach the water pump, because water pump pulley was wobbling. Should I also replace the water pump?

Not only the ABC hose broke in the process, the vacuum line which I think belonged to Solenoid purge valve (not sure though) also broke in 2 pieces since it was already brittle.

One final thing to add, I locked the hood permanently after removing and re-installing the hood latches opss.... I forgot to tighten the latch cable properly before shutting the hood, so thanks to me

Any insight on all my problems (including part recommendations) from anyone will highly be appreciated since my car is sitting in the parking lot for the past 3 weeks and I don't know where to start from. Repair shops are about 30 miles away from where I live.

Will be waiting for reply....

 

[slonar21]

These diagrams might help for the part number
LINE ARRANGEMENT OF HYDRAULIC SYSTEM. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta
LINE SCOPE. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta
LINE ARRANGEMENT OF HYDRAULIC SYSTEM. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta

I don't have any recommendation for the water pump as I do not have any experience with this... WATER PUMP. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta

For the hood I guess if you remove the grill you will be able to unlatch it

My main recommendation is do not run the engine, if your ABC pump runs with no fluid it will die with-in seconds!

Seriously I would get it towed on a flat bed to a dealer or a really very good indy that you a 100% knows about ABC, if you want to do it your self I think you will need to lift the car of its wheels (jacks) and replace the hose, if the hose you are talking about is a high pressure hydraulic hose you can go to a hydraulic shop with your hose and they can make an exact copy, but I just can't imagine you "broke" a high pressure hose. once installed if the fluid in any way has leaked out the system you need to prime the pump somehow, look in these forums you will find some info about how to do that.

Good luck

 

[MB Dragster]

These diagrams might help for the part number
LINE ARRANGEMENT OF HYDRAULIC SYSTEM. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta
LINE SCOPE. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta
LINE ARRANGEMENT OF HYDRAULIC SYSTEM. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta

I don't have any recommendation for the water pump as I do not have any experience with this... WATER PUMP. Fits: 2003 Mercedes CL 600 Coupe | Mercedes-Benz of South Atlanta

For the hood I guess if you remove the grill you will be able to unlatch it

My main recommendation is do not run the engine, if your ABC pump runs with no fluid it will die with-in seconds!

Seriously I would get it towed on a flat bed to a dealer or a really very good indy that you a 100% knows about ABC, if you want to do it your self I think you will need to lift the car of its wheels (jacks) and replace the hose, if the hose you are talking about is a high pressure hydraulic hose you can go to a hydraulic shop with your hose and they can make an exact copy, but I just can't imagine you "broke" a high pressure hose. once installed if the fluid in any way has leaked out the system you need to prime the pump somehow, look in these forums you will find some info about how to do that.

Good luck

Thanks for very helpful suggestions. It is the hose that goes inside the ABC reservoir bottle Cap. It is very soft at the cap. IMO it should be low pressure since it is a return hose to bottle and I will be able to handle the replacement because I have already removed the cooling fan. This hose holds the reservoir filter at the end. Do you think hydraulic shop will be able to duplicate it? I will try to upload a pic.

 

[slonar21]

Look at the first link and the number 10 in the left diagram or this link HOSE. LINE ARRANGEMENT OF HYDRAULIC SYSTEM for 2003 Mercedes CL 600. #2209970952 seems to be what you are looking for.

And no a hydraulic shop will not be able to duplicate a soft specific shape/bend hose, you will need to order from the dealer

I guess if this soft hose is your problem you will not need to lift the car to repair

 

[MB Dragster]

It looks like #40 in the diagram since it seems to be going into the ABC reservoir cap, but it has two part numbers as follows

A 03875020030307
A 03875120030307

Which is the latest one?

 

[slonar21]

Probably the second one, also if you get your hood open you can check on the hose its self; usually the part number will be printed directly on it, that way you can be certain you order the right part

 

[MB Dragster]

I have heard that you have to sacrifice front grill in order to unlock jammed hood on this car, is this correct? Even then, I don't know how you gonna reach left and right hood locks. Has someone ever been through same kind of issue before and documented the procedure?

 

[slonar21]

The hood thing is not ABC related, you should start a new thread, try this it might help
http://www.benzworld.org/forums/w220-s-class/1543384-engine-hood-stuck-how-open.html
Stuck Hood Latch - MBWorld.org Forums