WHTEVO

Thanks for the write-up.

Aaron

LeBenz88

Simple enough job to do... I had a mechanic do it on my 05 e500 for under 75$ including the parts, time was under 1 hour..... ( Current location of Car is Amman, Jordan)

eaglewwit

Is it most likely the changeover if all vents (front and back) are blowing cold/ambient air when the heat is tunred on, but blow colder than ambient air if the AC is turned on? Or is it the S.A.M.?

Thanks

Heinz

sorry guys but I just had too pump this thread again, payin respect to w211 ryda

Thanks.

eaglewwit

Just did mine and had a few hangups.

1. The o ring on the valve that goes into the engine bay was too big in the new unit. It took me over an hour to figure out why the damn thing would not fit back in. I finally looked at the o rings and noticed that there was a very small difference, about 1/2 mm, between the one from the old valve and the new one. So I put the old one in the new valve and it fit like a glove.

2. I somehow stripped the socket on the wind shield wiper. I think I did not have it on tight enough and tried it stripping it. At least my driver side works. Anyway take time when re installing the wipers. Now I have to find a new wiper and hope the drive screw is not worn too much.

DerHammer

Followed the steps outlined in the post and replaced my changeover valve with no problems. I had to refill a small amount of coolant to make up for the little that comes out when you disconnect the hose going into the engine bay. I also had a terrible time getting the windshield wipers to work properly again, but after repositioning them and tightening them 3-4 times they work great again. Thanks again for the excellent write up!

Johnny Oxford

Hi guys, brand new on here, first post, just changed my old W210 for a W211, still 320 cdi, this one is Jan 2004.

I have the heater problem so was encouraged by this thread, bought the part from local dealer, £24.00 here in England.

I got the weather strip off, removed the wipers etc etc, all OK, at this point I lifted the rubber flap and the valve was not there.

On further investigation I found it below the brake thingy (with lots of pipes), and looks very difficult to get at. Certainly beyond my capability.

So I have booked it into my local garage to have them change it for me.

Worth noting this guys, so any UK (or other RHD) unfortunately it is not so easy.

Thanks anyway, I will keep an eye on this forum.

GRAFH

320 cdi is the problem.

zambezi2

Magnificient post. Very well done, and lucky owners of W211 for this.
However, I have a W220 and need similar info for the duo valve that controls the reai air condigtioner. That rear AC only blows air, but not cold air. Must be the duo valve.
Can anybody help?

nizam9w2ms

Hi Guys,
I am currently having problems with the air conditioning. It seems that the right side (driver side) is blowing hot air instead of cold air, while passenger side is blowing cold air like it is supposed to.

Are this Changeover/Heater Control Valve cause of my problem?

Thanks You in advance.

eightball04

my friend, i would thank you for sharing your experience in such detail , i"m having the same situation. i'd apppreciate you sharing where you purchase your part. i can't find itz for that price

zambezi2

RYDA that is an excellent DIY piece of work. Can you or anybody direct me to a similar report for the Duovalve that controls the rear AC on a W220?
Thanks

Aliaz

Aircon on, but air doesn't feel cold (E320 CDI W211 2007).

I was at a workshop. Both the cold and varm had a good pressure.
He got the temp down to 6 celcius degrees by measuring the temp at the vents-opening inside the car.

He said that there was enought refrigerant on the system - because it could cool down to 6 celcius degrees (he didn't emptied the refrigerant). He also showed me the water drops on the cold tube.
Nothing else was done.

The next days I tried setting the temp at 12 celcius degress or LOW and the fan at full power - no cold air :-(
In 3 weeks before I visited the mechanic the vents mostly blows normaltemp-air. (only periodic I think I felt cold air).
I can't feel any difference in the 4 zones. All normal temp air.
Does that excludes the heater control valve?
What's wrong?

0-60inAMG

Thank you for the write up and pictures w211 RYDA, I completed the job yesturday, it is nice having cool a/c in the back. My water stays nice and cool now that the console is not at 100 degrees. I got the original Mercedes parts from mbzwholesaleparts.com out of Portland Oregon, a couple dollars more than parts.com but they allow Canadians to purchase with a credit card. thanks again for the info, I really appreciate it.

Raza00

Pictures are not displaying...any one else having this issue?

Any possibility of posting the Instruction in PDF?

Cheers!

phampau

Nice writeup! Need to do my e55 soon, the pictures are not working for me?? Does anyone have the pictures or PDF file they could kindly email to me at paulvpham@hotmail.com
Thanks in advance! Paul

Raza00

Can someone plz email me as well? Thanks in advance!

W211 Ryda

Sorry fellaz! I had some issues with my photobucket account. I'll have it fixed by this weekend.

Raza00

Thx

cupertino

I have the same problem on my 2008 E350 65K miles.
When its 90 F outside, it will blow super HOT air when I start engine. after 2 min, it will start blowing cool air, not cold air.
Checked my freon level, has good pressure & no leaking.

Can anyone tell me if this is right part to replace ?

Thank you.

willy_manilly

Does anybody know how to do this DIY when you have a Right Hand Drive car, the bloody valve is under the brake system filler bottle

firedragon1964

To Chiro, in point 9, I wanted to know how did you correct the O ring inside from been askew. I follow the whole replacement procedure (espectacular explanantion by the way), but now I am challenged by the inside ring. Please, help !!!

ozusa

For right-hand drive RHD, look at post #29. That may help, but frankly the hoses look very, very different to my LHD E320.

john0183

The DIY was very descriptive and good pics on step by step even explained about when taking out the screws they are tough, i ended up taking the whole wipers out to make it easier when taking out the heater valve i also recommend using needle nose pliers also the hanger worked alittle but the needle nose is better it took about 1hr and half thats taking time and going through everything .Thanks once again.

Douglasdw

This write up is what makes this group so fantastic to be a part of. I should have checked here before I had the dealer fix my '04 E320 Estate for $500. I do have a 2-yr. warranty on parts and labor associated with all repairs. So, there is peace of mind.