Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - alastair kirk

My car suffered "chugging" when accelarating between 30 and 40 or going up hill.

Mb of Bath diagnosed the fault as glycol leaking into the transmission from the valeo radiator. This is a common fault which MB are well aware of and did not recall the cars or inform the owners of the potential financial ticking time bomb. MB of Bath did not fix my fault and returned the car to me with gear box issues which were not there when I gave them the car, and in addition on their invoce the told me not to drive the car as that would further damage the car. I am taking MB of Bath to court. I would welcome any comments/advise/experiences.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Armitage Shanks {p}

What is the age of the car and does it have a full MB service history. Worth investigating with MB why their own agents are unable to remedy the fault. Have you paid for the work?

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Collos25

I think that it is far from a ticking a time bomb affecting about 1 in 80,000 cars over a certain age and mileagei and only a certain type of engine gearbox configuration.I do not think the OP has given us the full story perhaps he wanted it repairig for nothing I do not no It will be interesting to hear the outcome there is a genuine fault not only with Daimler but I would put it down to an age related problem,my father always used to say big cars big expensive problems.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

I think that it is far from a ticking a time bomb affecting about 1 in 80,000 cars over a certain age and mileagei and only a certain type of engine gearbox configuration.I do not think the OP has given us the full story perhaps he wanted it repairig for nothing I do not no It will be interesting to hear the outcome there is a genuine fault not only with Daimler but I would put it down to an age related problem,my father always used to say big cars big expensive problems.

I reckon at least 50% of 2002-2005 W211's over 60k miles have suffered or are about to suffer this issue. It is very, very, common. A lot went early on so got done under warranty (some within 2 years and 20k miles).

Just another example of shoddy Merc quality from this era. They knew about the issue but did nothing to fix it for 2 years.

It isn't one in 1/80,000!

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Collos25

I think that it is far from a ticking a time bomb affecting about 1 in 80,000 cars over a certain age and mileagei and only a certain type of engine gearbox configuration.I do not think the OP has given us the full story perhaps he wanted it repairig for nothing I do not no It will be interesting to hear the outcome there is a genuine fault not only with Daimler but I would put it down to an age related problem,my father always used to say big cars big expensive problems.

I reckon at least 50% of 2002-2005 W211's over 60k miles have suffered or are about to suffer this issue. It is very, very, common. A lot went early on so got done under warranty (some within 2 years and 20k miles).

Just another example of shoddy Merc quality from this era. They knew about the issue but did nothing to fix it for 2 years.

It isn't one in 1/80,000!

Facts do not bear your hearsay statement out my son owns a BMW and a Mercedes Agents in Germany and has had not one with this problem although as I said it does exist there is no doubting that .50% of W211 over 60k are affected where do you get figures like that from not all W211s are affected, not all are affected,not all are actually fitted with Valeo,not all Valeo are a problem my figures come from Daimler I think yours come from the toothfairy.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

Facts do not bear your hearsay statement out my son owns a BMW and a Mercedes Agents in Germany and has had not one with this problem although as I said it does exist there is no doubting that .50% of W211 over 60k are affected where do you get figures like that from not all W211s are affected, not all are affected,not all are actually fitted with Valeo,not all Valeo are a problem my figures come from Daimler I think yours come from the toothfairy.

From experience of dealing with the stinking pile of turd that is the W211 on an all too regular basis!

Abysmal car - hated by the motor trade. Maybe more RHD models had the Valeo radiator or something (some had a Behr make) but it is a massive issue on 2002-2005 UK models.

Daimler lied through their teeth over this and many other issues from that era.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Cyd

I would welcome any comments/advise/experiences.

There really isn't enough information in the op for any meaningful comment.

I would imagine, however, that water ingress to the transmission is the result of corrosion weakening the oil/water interface. For this reason it would be vital to have the coolant flushed and refreshed at regular intervals.

My Saab Aero has a engine oil to engine coolant oil cooler. For reason given abvove (and that it has a water cooled turbo) I thoroughly flushed the cooling system at 5 years old with a cleaner and refreshed with coolant / deionised water / water wetter mix even though the system "looked" clean. Although the ethylene glycol (antifreeze) will last for decades, engine coolant also contains a corrosion inhibitor package which only has a finite life (2, 5 or 10 years). If you don't know what type of coolant is in it, change it early.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - cws

The root of the problem is the Valeo radiator and flushing the coolant system probably would not have stopped the problem ultimately happening.

I can't work out why, apparently, the MB dealer didn't quote for fixing the problem - sum total would have easily exceeded £2K! Not only would the radiator have been replaced+coolant, but the gearbox would also have required a strip down/clean and potentially a new torque converter.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - gordonbennet

Hope you're going the small claims route, otherwise the costs against you could be eye watering, and if you lose, you'll still have to fix the problem anyway via a competent MB specialist indy, or scrap the car.

Its one of those things, you didn't research well enough and not doing so bit you in the behind, i expect that could apply to most of us here, lesson learned.

My own MB E320 bit me in the behind around 5 or 6 years ago, when the engine wiring loom disintegrated (known problem) causing the coils to short out, and spiking the ECU too just for good measure.

If i'd gone to MB that would have cost me £2.5 to £3k to put right, as it was my venerable MB indy replaced the wiring loom and all coils, and got the ECU repaired (a perilous journey that where con men and shysters abound), total cost around £1200.

Ironically enough, only the previous year i'd replaced the spark plugs and checked the loom, and my indy had checked the loom for exactly this only probably 6 months before failure, no one to blame really its just one of those things, when these things go they do so quickly and without warning, the car cost about £50k new, so £50k car repair bills are to be expected,

MB arn't going to entertain even a common problem on a 10/12 year old car, and i have my doubts that the most sympathetic judge would find in your favour here, but the best of luck to you.

Edited by gordonbennet on 18/02/2014 at 11:59

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Brit_in_Germany

As HJ wrote many moons ago:

The transmission oil cooler of automatics is sited in the radiator matrix, so failure can lead to coolant entering the transmission and destroying it, leaving the owner with a bill of £4k +. Officially the VIN numbers are Model 209.365/375/376/465/475. Apparently this fault occurred in cars manufactured between 2000 - 2003 and only when a Valeo radiator is fitted.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

What are you taking MB Bath to court exactly for?

They sound like they have diagnosed a very common problem in Mercedes cars of this era. Mercedes have done nothing for customers with this issue so are not going to start now.

They are quite correct, that the more you drive it, the worse it will get until it literally grinds to a halt. The glycol starts stripping the friction material off the toqrue convertor and then proceeds to do the same to every gear in the gearbox. Eventually there will be no friction material left and it will not move.

The car required the gearbox to be rebuilt, a new radiator and a thorough coolant flush.

It effects lots of Mercs, W211 most of all, upto about 2005ish.

Only solution is to flog, stomach the repair and/or never buy another Mercedes. Sorry.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - thunderbird

Confused abot the OP's post. You took them a faulty car but

MB of Bath did not fix my fault and returned the car to me with gear box issues which were not there when I gave them the car,

and

told me not to drive the car as that would further damage the car

Looks to me they diagnosed the fault (which was the gearbox) but did not repair the car. Presume they quoted you a price for the work which you did not like.

What are you taking them to cout for exactly. Not repairing a car was not a criminal offence some years ago, is it now.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

OP should be glad they didn't do anything.

You do *not* want a Mercedes garage doing this sort of work - you'll pay through the nose.

Take it to an autogearbox specialist who will have done loads of these. You're still unlikely to get change from £2000 however (but it'll probably be £4k at Mercedes).

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Cyd

From what I can read above:

# the fault is 'common'
# it afflicts cars with a Valeo rad
# and happened to cars under warranty (sub 2 years old)

It probably isn't corrosion then (this should be held at bay for well over 2 years).

Which leads me to ask:
Does anyone know what is the root cause of these failures, please? I'm interested to know.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

Which leads me to ask:
Does anyone know what is the root cause of these failures, please? I'm interested to know.

It was something to do with the combination of metals used causing a join to fail. I'm sure the exact reason can be Googled.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

Incidentally, Google "W211 valeo problems" and tell me it is 1/80,000!

They'd made about 800,000 by 2005 which implies there should only be 10 cases in the world.....anecdotal evidence says otherwise.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - medview

The radiator assembly has two sections sharing a common seal. One section contains glycol and the other contains auto transmission fluid (ATF). Guess what happens when the seal between the sections breaks down... You get a progressive increase of glycol in the ATF and a progressive decline in the transmission performance as it loses frictional material from the clutches.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Cyd

The radiator assembly has two sections sharing a common seal. One section contains glycol and the other contains auto transmission fluid (ATF). Guess what happens when the seal between the sections breaks down... You get a progressive increase of glycol in the ATF and a progressive decline in the transmission performance as it loses frictional material from the clutches.

Oh, very good Med. I hope giving snide and derisive answers on a forum makes you feel good! It's t***s like you that spoil this forum and cause people to go away and not return.

If you were on my team and gave that sort of answer to a colleague with a question, I'd give you a formal reprimand.

Now, do you know the answer or not? My guess is, not.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Collos25

Incidentally, Google "W211 valeo problems" and tell me it is 1/80,000!

They'd made about 800,000 by 2005 which implies there should only be 10 cases in the world.....anecdotal evidence says otherwise.

Exactly my figures are for all 211s like I said your original figures come from a tooth fairy you neither know the true figures or you listening to to many hearsay fabrications.A badly serviced 10 year old eclass breaks down hardly news is it.If the OP had taken the car to a proper Daimler garage for its servicing the problem would probably not have arisen.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

Exactly my figures are for all 211s like I said your original figures come from a tooth fairy you neither know the true figures or you listening to to many hearsay fabrications.A badly serviced 10 year old eclass breaks down hardly news is it.If the OP had taken the car to a proper Daimler garage for its servicing the problem would probably not have arisen.

Sorry, but this simply isn't true. Many have failed well before any coolant flush is due and I know of many cases where they failed in warranty. Servicing has nothing to do with it.

There was a manufacturing fault with the radiator. Even Mercedes half acknowledged it in the end in a TSB.

Models before 2002 and after mid-2005 do not tend to be effected nor do models fitted with a Behr made radiator.

Every independent knows about it, every Mercedes dealer in the UK knows about it, anyone working in the motor trade will know about it. Anyone buying a Mercedes from this era should know about it and you are doing them a disservice by denying it.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Cyd

I think I've found the answer to my question:

It appears to be a problem with the crimping of the end tanks. Can't find a specific description, but presumably the poor crimping allows the end tank to come loose which in turn allows the two fluids to mix. The transfer would be coolant to atf since the coolant is at a higher pressure.

If you follow the link below and scroll down part way, there is a post containing a pdf bulletin which shows how to identify rads at risk and shows pictures of the old and new crimping methods.

mbworld.org/forums/clk55-amg-clk63-amg-w208-w209/4...l

I know this has been a problem on some intercoolers too. It affects coolers with plastic end tanks. the crimping releases and boost is lost.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - slkfanboy

The car being over ten year old i sadly think MB will simply say the car is beyond it's useful life. MB don't hold part for 10+ year old car as my dad found out. Had the car been less than 5years old with a full MB service history you might have better luck.

Pre year 2000 MB had worse issues like MB UK dealers welding on 3 party air con's and other extra bits to new cars. Gladly after 2000 MB purchase the dealerships and improved the products. So nearly all the bad was gone by around 2005.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Brit_in_Germany

Exactly. Another link to an HJ comment:

http://www.honestjohn.co.uk/askhj/answer/26950/valeo-of-the-doldrums

I cannot see any reason for Collos to be denying the existence of this problem unless his son entered the business only after the affected cars had hit the scrap heap.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - cws

From Mercedes-Benz:

Humming/droning noises, or jolting during gentle acceleration between engine speed of 1200 - 2500 rpm -

Topic number
LI27.55-P-019975 Version 2 Group number
27.55 Transmission oil cooling Date
04-18-2005 Validity
Model series 203 up to production date 9/2003 with M111/271/112/OM646/OM611/612.990 and automatic transmission 722.6
Model series 209 up to production date 9/2003 with M271/112/113/OM612 and automatic transmission 722.6

Model series 211 up to production date 9/2003 with M271/113/OM628/647/648 and automatic transmission 722.6

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - Collos25

Exactly. Another link to an HJ comment:

http://www.honestjohn.co.uk/askhj/answer/26950/valeo-of-the-doldrums

I cannot see any reason for Collos to be denying the existence of this problem unless his son entered the business only after the affected cars had hit the scrap heap.

You obviously do read very well or is that another failing I stated at the outset that it was a problem .

The total number of properly serviced vehicles with the autogearbox/Valeo problem is extremely small compared with the total cars produced ,when a car such as this has a proper service history and I repeat a proper service history and a fault arises due to faulty workmanship then Daimler will look upon it very kindly.My son has been in business for many years he prefers BMW l prefer Mercedes ,I repeat a poorly serviced old mercedes breaks down full page news in reality its somebody who cannot accept that things go wrong with old unserviced cars.

Mercedes-Benz CLK-Class W209 - automatic gearbox with a valeo radiator - pd

The total number of properly serviced vehicles with the autogearbox/Valeo problem is extremely small compared with the total cars produced ,when a car such as this has a proper service history and I repeat a proper service history and a fault arises due to faulty workmanship then Daimler will look upon it very kindly.My son has been in business for many years he prefers BMW l prefer Mercedes ,

What is in the service schedule which makes any difference to this fault?

The fault is a design fault in the Valeo make radiator. You could service it every 2 days at a Mercedes franchise it will make no difference. The only thing which might make a difference is a coolant change which is scheduled at 150,000 miles or 15 years!

Google the the fault and see how common it is.

Obviously Mercedes are not going to do anything on a 10 year old car but many failed at 4 and Mercedes UK didn't so anything for them either.

If you catch it early enough you can get away with a torque convertor and new radiator which isn't as bad.

You're in Germany. Maybe Daimler has a different customer approach in their home market.