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DIY: Installing a new Changeover/Heater Control Valve

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E-Class (W211) 2003-2009

DIY: Installing a new Changeover/Heater Control Valve

 
Old 10-26-2016, 06:50 AM
  #276  
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E240 -2003 E55 AMG -2005
No didn't bother with hose clamps you don't lose that much coolant, just topped coolant of after replacing valve.
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Old 11-05-2016, 12:21 PM
  #277  
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'05 E320 CDI '02 CLK 430 Cabriolet '97 E430
Thanks for the excellent detailed instructions. I have one small addition. Remove the engine cover. I was struggling with the installation until I decided to remove the engine cover and in 15 seconds the valve was in. Thanks again. (2005 E320 CDI)
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Old 01-01-2017, 05:52 PM
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e500
Great post. Def remove the wiper linkage. The most difficult part for me was pulling the 90 degree hose from the single port towards the engine. I finally got that off and it was very difficult the reinstall with the new unit. Finally took advise from a post on here to pull the old O ring and use it. Also, I would have the clips opened when installing. It makes it so much easier than having them closed and have to push so hard. Worked perfect. Great to have warm air again.
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Old 01-08-2017, 08:43 PM
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Great DIY. Did mine on my E500 in about 1.5 hours IN THE SNOW. Pretty straight forward, I took off the wiper assembly which made access easy. I had trouble getting in the 90 degree hose until I put a touch of Vaseline on the o-ring, slipped right in, lol.


Heater is working great again, love this car.
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Old 01-08-2017, 09:25 PM
  #280  
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BBRI4570: what were the symptoms suggesting that your control valve had failed?
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Old 01-08-2017, 09:29 PM
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Originally Posted by Heatwave View Post
BBRI4570: what were the symptoms suggesting that your control valve had failed?

No heat through climate control at any setting. It was fine one day, next day, nada.


Of course it was during a cold snap when I really wanted heat. Saw the DIY for this common issue and figured the cheap part was a good place to start.


Worked like a charm.
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Old 02-26-2017, 09:56 PM
  #282  
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As you can see above I replaced mine about 2.5 years ago, was fine.

Now the hot air has stopped again, only blows cold.
Do these die regularly ?

before then it was perfect.
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Old 03-22-2017, 03:20 AM
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I replaced the valve and still no heat. Is there a fuse that I need to replace? Where would i find this fuse? Or should i check the electric pump? And is there a fuse for this electric pump? Thanks all!
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Old 03-23-2017, 12:16 AM
  #284  
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Originally Posted by xdrifter View Post
I replaced the valve and still no heat. Is there a fuse that I need to replace? Where would i find this fuse? Or should i check the electric pump? And is there a fuse for this electric pump? Thanks all!
It could be a bad chip in the SAM. Mine was shot and I'd always get heat.... see my thread on replacing it -

https://mbworld.org/forums/w211-amg/585066-rear-vents-blowing-very-hot-air-when-c-already-replaced-heater-controlvalve.html
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Old 04-10-2017, 06:06 PM
  #285  
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Thanks to the OP for this. Fixed my rear vent hot air issue by replacing this valve. Took me about 1.5hrs. Easy to do when you remove the wiper assembly as stated in previous posts. The 4 plastic rivets on my e55 have phillips heads and just unscrewed. After unscrewing them I just popped them out with a screwdriver.
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Old 05-09-2017, 01:15 AM
  #286  
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Thanks to the OP, great thread.
My 11/04 E55 had no heat so I just went through the hell of replacing this in a RHD car and I now have a working heater!

Last edited by ben73; 05-09-2017 at 03:24 AM.
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Old 06-11-2017, 02:37 AM
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So I just attempted this and after I put everything back, the car is puking coolant. Have to take it apart tomorrow and see where it is thats leaking.

When I pulled the elbow off the front facing port, I noticed the end of the tubing was corroded and a part of it was stuck in the old valve... wondering if anyone has replaced just the elbow of the tube and what part number it is?
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Old 07-01-2017, 03:53 AM
  #288  
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Could we get a repost of the photos as the links have expired?
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Old 08-04-2017, 08:46 PM
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Originally Posted by broncc View Post
Could we get a repost of the photos as the links have expired?
Was there ever a .pdf created of this DIY with pictures in it ?

It seems like the pictures come and go.

If someone has all the pictures, please create a PDF file with the instructions included and updated if possible.

It probably takes less time changing it than reading 12 pages on this post.
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Old 08-05-2017, 03:50 PM
  #290  
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See attachments...
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Old 08-05-2017, 07:11 PM
  #291  
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Heat exchange control valve problem again?!

1

Last edited by medootoo; 08-06-2017 at 11:52 PM.
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Old 09-08-2017, 08:03 AM
  #292  
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Thanks so much for posting this! I changed it out in under 2 hours and everything is working correctly now--you saved me a ton of money. THANK YOU!
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Old 11-07-2017, 09:07 PM
  #293  
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Thumbs up love the heat

This is a great DIY and I'd like to express my thanks too to w211 ryda - mabuhay ka brad!

My unit started failing when I couldn't get cold air unless I put the temp to the coldest. This is during summer this year. Then when weather got cold recently I stop getting the heat and it just blows cold air. How ironic right? Anyway, I finally did this over the weekend. When I finally installed it, before putting everything back in place, I tested my heat by letting it sit at idle while engine is running. But still no hot air comes out. I read this whole thread and found that some folks got heat after driving it around. Thats what I did and then it happened... the heat goes on! Whew I was afraid it could be another issue. Thank God I got my heat back just in time because today starts to get cold here in the north east. My advice to add is sometimes the wiper gets super stuck just like my driver side wiper. And I tried prying it out but no luck. I found out in 'pelican parts' website they used a battery terminal puller to pull out the wiper from the wiper linkage. I didn't get to do that so I worked while the driver side wiper are still intact. Its a pain so just take time to remove the wiper assembly for easy install. Cheers!
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Old 08-07-2018, 04:53 PM
  #294  
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I didn't see anyone mention resealing the cowl cover to the windshield? what do you use for this? thanks
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Old 02-13-2019, 10:02 AM
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W211, W123,W201
African solutions

I live in South Africa and have had this issue with my E200K. An auto electrician removed the valve as described here and prised it open. He diagnosed a dry joint and, after some soldering, the valve worked like a charm. This electrician also resolved a problem I had with the combination switch which would change from indicating left, to indicating right, without any input from me, with no new replacement parts fitted. I guess with a lack of resources, comes a lot of resourcefulness.
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Old Yesterday, 06:28 PM
  #296  
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Mercedes A140, G270CDI
Angry W463 heater

Hi, having problems with the heater. Trying find the heater control for the W463, I see the hoses going in to the firewall from the engine compartment, but no heater control valve. Anybody know can I reach it to check it?

Appreciate any tips, description, photo and/or diagram.

Searched entire web to no avail.

Regards
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