******Rear A/C blowing hot air- Front blows cool ?
Thread Starter
MBWorld Fanatic!
Joined: Oct 2012
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From: Canada
2004 E55 AMG
******Rear A/C blowing hot air- Front blows cool ?
As the title suggests.
The front A/C is blowing cool air whilst the rear is blowing hot air.
I've tried manually lowering the temps down to all the way to "low"
I've tried leaving it on "Auto" and no avail ?
Anyone knows what the hell is going on ?
I've tried turning off and starting my car again and still nothing.
This is so stupid
The front A/C is blowing cool air whilst the rear is blowing hot air.
I've tried manually lowering the temps down to all the way to "low"
I've tried leaving it on "Auto" and no avail ?
Anyone knows what the hell is going on ?
I've tried turning off and starting my car again and still nothing.
This is so stupid
Member
Joined: Dec 2013
Posts: 165
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2004 E55
I just replaced my heater control valve this past weekend. I used a write-up on this site. Make sure to order some new clips for the cowl because they will probably break. It took me about three hours going slow.
Last edited by Rallyboy383; May 20, 2014 at 07:29 PM. Reason: added some info
Thread Starter
MBWorld Fanatic!
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Posts: 1,242
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From: Canada
2004 E55 AMG
This is nonsense.
I called the dealer and first of all they didn't know what a DTB is and then second they said
they would have to diagnose before replacing anything and they have no service bulletin for this issue.
Is this what you guys used ? Is the part number and everything correct?
https://mbworld.org/forums/e-class-w...rol-valve.html
I called the dealer and first of all they didn't know what a DTB is and then second they said
they would have to diagnose before replacing anything and they have no service bulletin for this issue.
Is this what you guys used ? Is the part number and everything correct?
https://mbworld.org/forums/e-class-w...rol-valve.html
Super Member
Joined: Jun 2012
Posts: 959
Likes: 36
From: Maryland
W212 E63 AMG S Model
This is nonsense.
I called the dealer and first of all they didn't know what a DTB is and then second they said
they would have to diagnose before replacing anything and they have no service bulletin for this issue.
Is this what you guys used ? Is the part number and everything correct?
https://mbworld.org/forums/e-class-w...rol-valve.html
I called the dealer and first of all they didn't know what a DTB is and then second they said
they would have to diagnose before replacing anything and they have no service bulletin for this issue.
Is this what you guys used ? Is the part number and everything correct?
https://mbworld.org/forums/e-class-w...rol-valve.html
Yup, you can get it at some of these online parts stores for like 30-40 bucks
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MBWorld Fanatic!
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E63
Even in the unlikely event your freon level is low, with rear hot, front cold (or cool'ish), you should change out your heater valve anyway (~$50 and a couple of hours).
Most likely you will have driver side warm and passenger cool if freon levels are to blame
Most likely you will have driver side warm and passenger cool if freon levels are to blame
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From: Cypress, TX
'06 E55, '15 Jeep SRT8, '94 Mustang GT
Super Member
Joined: Jun 2012
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From: Maryland
W212 E63 AMG S Model
Just a little tip... let the car cool down for a while before changing it. When you're pulling the old one out, coolant will come out and it'll be hot if your car hasn't sat for a while.
Newbie
Joined: May 2014
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2005 E55 AMG
yup i just changed my heater control valve and it took me about an hour. also you need to take out the whole wiper unit (3 bolts) and that will give you all the room you need. just order it as a kit off of ebay like i did and it will come with the clips for the cowl. i think it costed me 60.
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Joined: Oct 2012
Posts: 206
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From: Augusta, Georgia
2008 BMW M3 Sedan 6MT - Silverstone II/Fox Red Extended
I had this problem (along with a few phantom OBC failure messages for various components) and had the dealer replace the main battery. I never experienced any of it again.
, I haven't had mine lose freon before. However from what I've read it is usually the driver side that gets hot with low freon
Thread Starter
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From: Canada
2004 E55 AMG
Just as a closure if anyone comes searching for this thread.
I used this thread to replace my HVAC valve.
https://mbworld.org/forums/e-class-w...rol-valve.html
I used this thread to replace my HVAC valve.
https://mbworld.org/forums/e-class-w...rol-valve.html
Thread Starter
MBWorld Fanatic!
Joined: Oct 2012
Posts: 1,242
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From: Canada
2004 E55 AMG
Although a car of this stature the A/C could've been better. As in the air even at the lowest setting isn't that cold.
During the wiper assembly removal -I accidentally dropped the socket and bolt inside and now it's lost forever
Oh and you'd NEED patience cuz the plastic trim to get it off and back on is not for the faint of heart lol
During the wiper assembly removal -I accidentally dropped the socket and bolt inside and now it's lost forever
Oh and you'd NEED patience cuz the plastic trim to get it off and back on is not for the faint of heart lol
Thread Starter
MBWorld Fanatic!
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From: Canada
2004 E55 AMG
MBWorld Fanatic!
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From: Cypress, TX
'06 E55, '15 Jeep SRT8, '94 Mustang GT
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From: A to the Z (the state)
'06 E55
Also, if you're replacing the heater control valve, having a pair of hose clamp pliers might make life easier for you. The one spring-style hose clamp that needs to be removed was a real pain in the bunghole as the clamp part was rotated towards the firewall. This one clamp took about 30 minutes to remove and resulted in the deployment of many F-bombs.
I also had a spring puller in my toolbox which made short work of those latches. There is one that is waaaaaay down there. Spring puller is basically a hook like the bent coat hanger, but it's stiffer and has a handle.
I also had a spring puller in my toolbox which made short work of those latches. There is one that is waaaaaay down there. Spring puller is basically a hook like the bent coat hanger, but it's stiffer and has a handle.
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Joined: May 2018
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Cls550
Quick temporary fix
Great post and I will eventually get around to fixing the problem. After realizing that it’s basically an actuator, I turned the car on with the ac on max cool and simply tapped on the unit at the opening on the driver side fire wall where the clamp is and bam ❄️ cold air in the rear. This is my first post and I hope it helps someone as this forum has helped me immensely.
Last edited by Monsr; May 16, 2018 at 07:22 PM.
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From: Seattle
2008 Mercedes Benz E63
I did the heater control valve and it did not fix it. I had to replace a chip on the circuit board on the front SAM. I have the chips in stock if you need one, or you can replace the entire front SAM.
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From: La Jolla, CA
2005 W211 E500, 1993 R129 500SL, 1983 W126 300SD
What???
Originally Posted by layzie12g;[url=tel:7455969
7455969[/url]]I did the heater control valve and it did not fix it. I had to replace a chip on the circuit board on the front SAM. I have the chips in stock if you need one, or you can replace the entire front SAM.
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2015 Challenger Hellcat, 2023 Ram 3500, 2005 E55 Wagon, 2019 GLC63s
My 2005 E500 suddenly has this problem — out of f-ing nowhere. Rear a/c was ice cold last night. Today it’s blowing 130 degree heat while the front is blowing 62 degrees. Utterly ludicrous. So it might be an electrical problem now? How can I tell the difference and make sure I’m doing the correct job before I start tearing the car apart?
R.K.
