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CLK 270 CDI W209
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Discussion Starter #1
hi guys

wonder if anyone can help, i have a clk270cdi w209 on a 2003 reg, ive been having some problems with getting it to blow anything other than hot and the vents seem stuck on up only....with the weather we have been having lets just say its getting mighty sticky

ive been to merc who put it on the star system and said that the climate control panel is knackered, they quoted me £690 for a new one, so Ive bought one off ebay and fitted it, still the same story blowing hot and cannot change the direction on the vents, just took it back to merc who have said that the control panel i have put in is older than the car and wont talk to the ecu....seems they are having a bit of a laugh at my expense as its £114 everytime to plug it in....my question is anyone else had this?? or any ideas...i really dont want to buy another panel if i can help it but they say its too old....plugs are the same...i did upgrade it to the lux one with the digital displays rather than the manual knobs (i hate knobs)

any help you can give would be great....norwich merc dealers are rubbish so im happy to go further afield if needed
 

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Premium Member
2004 CLK 240 Coupe
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11,377 Posts
Does your 'climate control' panel have a small screen like this one below? If so, you can run a diagnostic to narrow down the problem.

Are you sure that your refrigerant is not low? This version of the a/c unit has a couple more external sensors than the other one, so I'm not sure that they are interchangeable....:confused: It needs checking out from the circuit diagram.
 

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CLK 270 CDI W209
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25 Posts
Discussion Starter #3
hello mate, yes it does have that one now, but the red and blue buttons are solid rather than the little triangles if that makes sense

how odd to join a fourm and you are from norfolk as well lol....im in thorpe st andrew
 

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CLK 270 CDI W209
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Discussion Starter #4
havent checked the refridgerent to be honest, it stills blow hot even when the rest button is lit and i mean hot....i did wonder if there was a duo valve or anything like that??

robinsons also said they think there are a coupel of stepper motors gone for the flaps not moving

but start with the panel.....i just cant see that a panel older wouldnt work

all in all i love the car, but its so hot lol
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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I believe what Keyhole was alluding to is the climate control damper reset, and this works on most all modern MBZ climate control systems. With the engine running, press and old the "RECIRC" and "FRONT DEFOG" buttons simultaneously until their indicator lights begin to blink. Release the buttons and watch the blinking lights. The airflow should cycle through a few changes, and the light will stop blinking after about 20-30 seconds. This resets the climate control panel and test the damper servos. If the indicator lights never stop blinking, then it means there is a problem with damper control system, which is most likely due to either bad servos or broken linkages.
 

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CLK 270 CDI W209
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Discussion Starter #6
hello mate, yes i tried that they dont stop blinking.....at the moment im trying to get it to not blow full out hot

which vents are next :)

thanks for your help and advice though im willing to try anything :bowdown:
 

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2004 CLK 240 Coupe
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I believe what Keyhole was alluding to is the climate control damper reset, and this works on most all modern MBZ climate control systems.
Well - I wasn't referring to that one (I call it 'normalizing') but it is a good idea...:)

What I was talking about is the a/c diagnostic test for checking the a/c sensors. I am not the author - I found it some while back. Here is how I have saved (and abridged it) in my files. It works fine on my W209 a/c system shown above.

Introduction

The Mercedes E-class air conditioning is a complicated system of blower motors, computers, relays, switches, and refrigeration parts. With a system this complex, it’s likely that you’ll encounter an air conditioning problem at some point during your ownership. Thankfully, the onboard climate control computer has a self-check mode that can help you quickly diagnose air conditioning problems.

Collect Sensor Data

First we’ll get the values of all the various climate control sensors. These sensors constantly monitor data like air temperature, refrigerant pressure, etc. Odds are if something’s wrong, a sensor will pick it up. Let’s get started!

Start your car. Press the “AUTO” button on your climate control.
Turn on the A/C (i.e. “EC” light must be off; if the light won’t shut off, continue with this test.

Let the car idle for about 3 minutes.
Set the temperature on each side to 72°F. You can do this quickly by pressing both the red and blue arrows simultaneously.

Press and hold the “REST” button for five seconds or until the left side of the display says “01.” The left side indicates which sensor you’re checking. In this case, #1 is the in-car temperature sensor. The right side of the display shows the value of sensor #1 (in this case, the actual in-car temperature).

Press the “AUTO” button on the left side to move to the next sensor. Press the “AUTO” button on the right side to move to the previous sensor.

Record the ID number of each sensor (left side of display) and its corresponding value (right side of display). For example, in the picture on the right, you would record that sensor #5 has a value of 6.
You only need to do this for sensors #1-8. You can write down the values for the other sensors, but they’re not really related to air conditioning function.

When you are done, press the “REST” button again to exit the self-check mode.

A/C Sensor Values. Enter the values from each sensor.

Sensor 1 - Inside Temperature:*
Sensor 2 - Outside Temperature:*
Sensor 3 - Left Heater Core Temperature:*
Sensor 4 - Right Heater Core Temperature:*
Sensor 5 - Evaporator Temperature:*
Sensor 6 - Engine Coolant Temperature:*
Sensor 7 - Refrigerant Pressure:*
Sensor 8 - Refrigerant Temperature:*


doug - The W209 does not have duovalves. W208 does.
 

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CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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@Keyhole - Interesting - I know all of that is available via SDS, but I did not know it was accessible locally through the A/C controls.

@Doug - It sounds like you have a problem in the damper system. Now you need to get someone with SDS to check the codes (a generic OBDII scanner won't do it - only MBZ SDS). This will tell you which specific part(s) are not working. Unfortunately, damper system repairs aren't easy - they require a lot of dash parts disassembly to get to the culprits.
 

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CLK 270 CDI W209
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Discussion Starter #9
yeah i know mate, at the moment im just trying to get it to stop blowing extereme hot all the time

I just cant beleive that the aircon panels all dont fit and work, MB reckon I have a older panel in my car than the car is and want me to spend £690 on a new panel from them.....which for the age of my car is just silly

Ill worry about the dampers next when I can sit in it and not roast my nuts off :crybaby2:

Besides I can always use MB for what wrong and get a Indy to do the work if I cant do it myself
 

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CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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Just wait a few months- you'll be glad that your heater is roasting your nuts off. :LOL:
 

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CLK 270 CDI W209
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Discussion Starter #11
im so angry its untrue......so turns out that when i pulled the aircon panel out to check the part number thats it it, some fool (not me) hadnt plugged in the smaller plug into the back of the panel....

plugged it in, done the normalise......blowing cold as a cold thing and all the vents are moving around now....

jesus, just goes to show trust no one except yourself to do anything on your car

thanks keyhole for the tip it was kind of that which prompted me to pull the panel off
 
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