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Replacing the Valeo

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Old Mar 12, 2012 | 04:35 PM
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2004 CLK320
Replacing the Valeo

I am planning to replace my radiator on my 2004 CLK320 (150K miles, possibly Valeo).

MB part no is 203-500-05-03. I called my local parts store and for my car, they have Nissens radiator in stock. They can order the OE (Behr) but it will take 3-4 weeks. Also, the Behr is $25 more.

The part no. of Behr is 376-714-331. Is this the right Behr part no?

Anyone heard of this Nissens radiator?

Last edited by mis3; Mar 12, 2012 at 04:40 PM.
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Old Mar 12, 2012 | 07:23 PM
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Sorry, have not heard of them....but from what I now know on this issue, I'd spend the extra so you don't have to 1. do it again 2. have the downstream issues with coolant leak/transmission problem...just my .02
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Old Mar 12, 2012 | 07:29 PM
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On second thought.....the other benz forum seems to like them and they are made in Denmark...maybe better than the perhaps now outsourced Behr to India?
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Old Mar 12, 2012 | 11:49 PM
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Originally Posted by mis3
I am planning to replace my radiator on my 2004 CLK320 (150K miles, possibly Valeo).

MB part no is 203-500-05-03. I called my local parts store and for my car, they have Nissens radiator in stock. They can order the OE (Behr) but it will take 3-4 weeks. Also, the Behr is $25 more.

The part no. of Behr is 376-714-331. Is this the right Behr part no?

Anyone heard of this Nissens radiator?
Where did you get that part n°??
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Old Mar 13, 2012 | 12:12 AM
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Are you sure you have the Valeo? I thought by MY2004, they were gone. You might want to check this thread:

Visual identification fo Valeo vs. Behr Radiator
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Old Mar 13, 2012 | 08:11 AM
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If you have a Behr - don't worry about it.

If you don't please fit the Behr. Don't mess with unknowns. It is not worth it.

Replacement Behr radiators are cheap.
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Old Mar 13, 2012 | 09:26 AM
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2004 CLK320
The Behr part number, 376-714-331, was given to me by the radiator store. He also gave me another number, 2337.

My car is a 2004 but the build date was JUly-2003. So, not sure which radiator I have. From looking at the diagram, it looks like the brand label is at the bottom (???). I will certainly check next time when my car is on the hoist.

My coolant system is working properly but since my car is 8 years old with 150K miles, is it time to replace the radiator? Is radiator something we have to change after a few years or after certain mileage? Of course, I would like to save the money and furthermore, there is always risks associated with each installation.

As for maintenance, I have replaced the coolant twice, once @62K miles and the 2nd time @135K miles. The 2nd time I replaced the coolant was because my water pump broke. They replaced the thermostat as well at the time.

I researched Nissen radiators last night. Nissen is also a reputable company and they still make their products in Denmark. Behr products are not made in Germary anymore!

Last edited by mis3; Mar 13, 2012 at 09:48 AM.
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Old Mar 13, 2012 | 06:10 PM
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If you buy a good reliable Behr in the US it is made in Behr's state if the art plant in SA. Built to supply the Benz & BMW plants here. Radiators do not require regular replacement if proper coolant is used & you are not in a highly corrosive area where fins rot off. The reason for changing Valeo radiators was coolant leaks into the transmission fluid cooler that destroyed many transmissions. If you have a Behr & your engine temp is normal I would leave well alone.

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Old Mar 13, 2012 | 07:30 PM
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at the mileage that you are at, I would not worry about it. I am guessing you have a behr instead of valeo.

i had a valeo....and not very knowledgeable about this AND was a noob on this forum. but i found out the hard way. had to replace radiator, tranny, and hoses.

since then, no problems and that was about 50k mi ago.
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Old Mar 13, 2012 | 10:11 PM
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2004 CLK320
I took a flash light and went to check my radiator. With limited view from the top and the sides, I could not tell which rad I have.
I guess the manufacturer label is located at the bottom. I will have to raise the car and check from the bottom.
I will do this next time I visit my indie.

Last edited by mis3; Mar 13, 2012 at 10:13 PM.
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Old Mar 13, 2012 | 11:03 PM
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Forget the label - just look at the way the metal grid attaches to the plastic tank. If it's wavy looking like in Glyn's pic, it's the Behr. The Valeo uses folded-over tabs in a "tooth" pattern.
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Old Mar 14, 2012 | 08:02 AM
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Originally Posted by Rudeney
Forget the label - just look at the way the metal grid attaches to the plastic tank. If it's wavy looking like in Glyn's pic, it's the Behr. The Valeo uses folded-over tabs in a "tooth" pattern.
The plastic tank is in the bottom with the hose facing inside, right?
I have to raise the car to check from the bottom, right?

Sorry. It may sound trivial to some but I don't work on my car much.

Last edited by mis3; Mar 14, 2012 at 09:12 AM.
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Old Mar 14, 2012 | 10:21 PM
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You should be able to look down the (USA) driver's side of the radiator and see the crimps. You may even be able to see the label if it's a Behr.
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Old Mar 15, 2012 | 12:38 AM
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Originally Posted by Rudeney
You should be able to look down the (USA) driver's side of the radiator and see the crimps. You may even be able to see the label if it's a Behr.
OK. I will look tomorrow.
Hopefully I can see the crimps @ the side of the bottom of the radiator.
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Old Mar 15, 2012 | 01:23 AM
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Greeting ! .. so I have to replace my valeo radiator on my 2003 CLK 500 with 100,000 miles ? Reason I asked cause I heard and read there were problems with that brand ! But I don't have any overheating problems or coolant leaks of any kind ! Can I get some more feedback on this issue please ?Thank you
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Old Mar 15, 2012 | 05:53 AM
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Not all Valeo radiators leak but the transmission cooler is in the base of the radiator & Valeo's were known to spring a leak from the engine coolant into the transmission fluid cooler part of the radiator. With the risk of a transmission failure being high as a result most swap out their Valeo radiators for Behr radiators which never suffer this problem.
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Old Mar 15, 2012 | 08:06 AM
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Originally Posted by jbenz99
Greeting ! .. so I have to replace my valeo radiator on my 2003 CLK 500 with 100,000 miles ? Reason I asked cause I heard and read there were problems with that brand ! But I don't have any overheating problems or coolant leaks of any kind ! Can I get some more feedback on this issue please ?Thank you
You rather be safe than sorry. I also have an 03 55, no overheating or leak issues but I am purchasing a new Behr. Member splinter helped me find the correct part number for my car, its A203 500 39 03. You will most probably need the same one. 214$ on parts.com
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Old Mar 15, 2012 | 11:33 PM
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OK thank you guys !!!!! I found this Behr Radiator on ebay what you guy think !! link: http://www.ebay.com/itm/Mercedes-W20...ht_1700wt_1270

Last edited by jbenz99; Mar 15, 2012 at 11:48 PM.
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Old Mar 15, 2012 | 11:59 PM
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FYI, the Valeo failure is really "interesting". It's actually just a bad o-ring where one of the inlets goes into the bottom tank. There was a guy over on benzworld in the W203 forum who took his out, dissected it and found the issue. I guess that o-ring could be replaced, but I think most people agree they'd rather just spend $250 on a new radiator as opposed to worrying about their $6K transmission.
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Old Mar 16, 2012 | 12:04 AM
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Originally Posted by jbenz99
OK thank you guys !!!!! I found this Behr Radiator on ebay what you guy think !! link: http://www.ebay.com/itm/Mercedes-W20...ht_1700wt_1270
It does say compatible with 2003 CLK 500 so go for it!

Originally Posted by Rudeney
FYI, the Valeo failure is really "interesting". It's actually just a bad o-ring where one of the inlets goes into the bottom tank. There was a guy over on benzworld in the W203 forum who took his out, dissected it and found the issue. I guess that o-ring could be replaced, but I think most people agree they'd rather just spend $250 on a new radiator as opposed to worrying about their $6K transmission.
You damn skippy I rather spend the 250$ for the peace of mind!
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Old Mar 23, 2012 | 09:51 AM
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I will go to the same indie for the 2nd transmisison service in 1-2 months so I can push more of the new ATF in my transmssion. I will check the radiator when the car is on the hoist and the covers are removed.

This indie is actually a Sprinter specialist. I noticed that Sprinter deployed 722.6 as well as the Valeo/Behr radiators. I hope that this guy is competent to replace my radiator if required.
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Old Mar 24, 2012 | 07:42 AM
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My rad is being replaced this weekend by a buddy of m ine.

Replacing it with another Valeo with part number A 203 500 42 09 if anyone is curious.

I couldn't get a BEHR in time and none of my local sources could grab one.
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