PCH_4.2

I just noticed that the rear vents are blowing hot air while the front vents are blowing cold. Anyone else experience this issue?
I only have 55300mi on the car.

Thanks!

PlatinumPi4u

I don't want to insult your intelligence, but deductive reasoning has worked well for me in the past...

So with that said, have you pressed the "rear vents" button and attempted to lower the temperature?

PCH_4.2

I did. Temp control up or down doesn't work.
I found the thread already. Heater control valve changeover issue.
Seems like alot of ppl have/had this issue.

And I just got done laying down 1500 for air shock and other stealer work.

PCH_4.2

FYI, it's hard to insult my intelligence...so it's ok.
My e500 is a garage queen and I'm starting to feel like I need to just drive it daily to work out all the kinks. Collecting cobwebs can't be good for the car.

maxi13

Search would've been helpful
It is a first sticky in 211 forum
https://mbworld.org/forums/e-class-w...rol-valve.html

MBNewbie2008

Hi PCH, I had the same thing happen to me last year. It's your changeover valve thats gone bad. My car had 53000 miles on it and I found out it happens on the older e classes.

maxi13

The part is $40 at autohaus
Even cheaper at parts.com but they charge S/H
The dealer quotes around $200-250 labor
An easy DIY in my opinion. Or do it at an Indy. Labor shouldn't be over 120-150 for an hour job

spinn

I actually had that problem. Was not getting any heat up front, but was able to get heat in the rear. Was having a tech check out my car and he mentioned that it's typical that the heater valve can sometime get stuck; he indicated mine is working fine now, but suggested I get it replaced through my 3rd party warranty.

NorseWagon

MB dealer replaced the valve on my wagon last year, it came to about $400.00.
The Total-Care warranty covered it. Same with the Air matic struts in the front, replaced @ the same visit. The whole whole bill came to about $4K.

Don't leave home without the Warranty on the old W211s

spinn

$400 to replace the valve? Considering the valve itself costs about $40, and labor shouldn't be more than 1.5 hrs, that's robbery. Good thing you had a warranty.

markpetersonii

Ugh... Mine is doing this now too. One more thing to add to the list.

NorseWagon

Well, the warranty was not just a piece of good luck, but a contract I signed with eyes open just because of horror stories like that

Now I don't have to sweat the next mechanical problem, or go chasing down the cheapest indy shop in the area: Just drop of the E at the dealer, get a loaner car and tell 'em to call me when it is fixed.

Will renew my contract and keep the car another 3 years after the present contract expires.

KEY08

There is an outside chance that changing the valve will not help you. I have had this same issue of blowing hot air at the rear vents for a year now and after changing the valve my MB dealer has traced the problem to a faulty S.A.M. I can trick the SAM into blowing cool air by raising the temperature and then lowering it back down. It is only a problem on the hottest days and I guess I'd rather let my rear occupants suffer than pay $1,000 for a new SAM.

spinn

found this article.

Talked to my tech, and he indicated he could change out the heater valve for me for $215. Considering he basically did a full pre-buy inspection to identify any problems for nothing, and my 3rd party warranty doesn't appear to cover the heater valve, and I've got limited spare time to perform the DIY, I think it's worth paying to have it done. Hopefully, that will take care of it and not require replacement of the SAM.

KEY08

Yeah, that article reflects the story of my dilema. Changing out the heater valve is an easy DIY, but $215 isn't a bad price if it includes the part. Let us know if the replacement works for you.

PCH_4.2

Thanks, I did find it yesterday.

PCH_4.2

I see, yea...looks like I'm just going to take it in. Too hot to work on the car myself. What did the repair cost you? Or did you do it yourself?

PCH_4.2

I paid for the Airmatic shock on the driver's side front just a month ago. That was $1600-1700 in itself....so $4k was about right for both front sides & the valve job.

Valve: $400...i see, thanks.

I'm in the wrong line of business.

PCH_4.2

The only way I can fool myself is...I just keep saying, "this is a nice C class rental they gave me...." LOL... so i don't pay attention to the repair bill pending.

I really should be more hands on with repairs.

PCH_4.2

Sorry to hear that. Wouldn't you think that they would do a tsb on this? Or it's just one of the wear & tear items.

PCH_4.2

Oh my...

Well, I'd originally thought it had something to do with all the work this dealer did on the car just last month. Front driver's side airshock change, tranny fluid flush, brake fluid flush. I thought they'd sabotaged something, lol. Dealer nightmares.

Oh, and the mechanic's cd in the single cd slot was a nice touch. I was like, "that's not my cd!". I guess a pre/post repair test drive requires nice music. He didn't like any of mine apparently. I can't remember what cd (belonging to me) is gone now. I did have one in there.

It's either I get it fixed or the E500 will just be a post 8pm drive car.

MBNewbie2008

Hey PCH, It cost me $210. I ordered the part at MBPartsOnline.com including shipping was $38 then went to an indy to install it (limited time for me too). Give them your vin number and they will match the part with your car.

Amaroo

I had the same problem and I change the valve as you said and now it's running good

Thank a lot

E2233

2009 E550 73,000 miles the rear AC vent was blowing hot air. I had the Mercedes-Benz extended warranty. The dealer complete the following:
1. Reset actuator motor
2. Replaced in rear remove and replaced.

E2233

Returned to dealer third week of February same problem.

This time the dealer under warranty replaced heater switch over/valve including coolant.