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  #1  
Old 12-19-2012, 07:21 PM
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98 Mercedes climate control

the climate control has quit working on my 98 Mercedes. Have checked the fuses and they are good, looking for any other ideas. Just before it quit working all together it would work, then quit, then work again. I have heat but no blower Jean C

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  #2  
Old 12-20-2012, 03:38 AM
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W210?
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  #3  
Old 12-20-2012, 04:04 AM
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More data needed

Quote:
Originally Posted by phillipj View Post
the climate control has quit working on my 98 Mercedes. Have checked the fuses and they are good, looking for any other ideas. Just before it quit working all together it would work, then quit, then work again. I have heat but no blower Jean C
We need at least:
Year
Model

As a wild guess to your issue:
* Blower Motor Regulator has failed...
Blower Motor Links Page


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  #4  
Old 12-20-2012, 10:24 PM
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it is a 98 MBZ E320, and has about 130,000 miles
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  #5  
Old 12-20-2012, 10:51 PM
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98 mbz

what can I try to check out to see if the control panel on the dash board is functioning as it should? What simple test would you try or is this simply a take it to a mechanic. Can a handheld mechanics computer tell what part is defective if any?
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  #6  
Old 12-21-2012, 10:11 AM
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I agree that a little more detail would be helpful.

Is it just not producing cold air or is it completely dead? There are built-in diagnostics but the unit must at least be active to initiate the tests.

Details can be found here - W210 Air Conditioning Diagnosis | EClassBenz.com

If it's dead, then about the only things to check are the connecting cable and the fuses. To pull the unit and look at the cable you'll need a set of 'radio keys'. They go in the slots at the bottom corners to release the locks for removal. Available online, at parts stores and from a dealer. Dealer (OEM) work the best in my opinion. Did you check the fuses with a tester? Eyeballing isn't always reliable. The two important fuses are #4 and #7 under the hood. There are usually spare fuses stored in the empty slots of the fuse panel. Since the 'joy to cost' ratio is so high you might want to just switch fuses for a test.

If the unit is getting power and is dead, chances are it has failed. There are companies like Beckman Technologies to do repairs/exchanges. New CCU's are very expensive so a replacement probably only makes sense on an older car.
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Last edited by RichardM98; 12-21-2012 at 10:22 AM.
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  #7  
Old 12-23-2012, 03:02 AM
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From your first post it seems that the blower motor regulator has failed. The AC panel is still fine and you can set the temperature and fan speed on it. When you set the temperature you might feel that it cools/heats the air but the blower is not working so the cool/hot air is not blown into the cabin. This is especially problematic when you need the front demister.

AC controller - Device in center console with LCD and buttons used to set the AC.
Blower Regulator - Device under passenger side dash the receives a signal from the controller and translates this into a signal to set the blower speed.
Harness - A.k.a loom, wire with connectors on both end, eg engine harness connects engine sensors to ECU,etc.

I opened my blower assembly and altered the harness that connects the blower regulator. Using an automotive switchover relay I placed a small switch with green LED in the glovebox. When the switch is open the regulator provides power to the blower motor but when the switch is closed the automotive relay switches over to a 12v supply to power the motor. This solution does not provide any speed control though. It is fas cheaper than replacing the regulator and if you ever replace the regulator you merely have to exchange it and ignore the switch, everything will then work fine. The advantage of of altering the harness like this is that if you leave the vehicle and forget to switch the fan off, the AC control module cuts power to the blower anyway after 5 seconds.

You can test your controller by holding down the rest button to put it into diagnostic mode. Hold the rest button for about 10 seconds until the display changes. Press the left Auto button to scroll down the list of diagnostic functions until you reach item 10(indicated on left hand side of the screen). If you change the fan speed now you should see a corresponding change in the value displayed on the right hand side of the screen. These values range from a minimum of 0.8 to a max of 6 if I remember correctly. If you are able to change these values by setting the fan speed from the AC controller then your controller is sending the correct control values to the regulator, but the regulator is faulty.

If you feel you want to attempt this I can look for my diagrams and pictures and post them?

Last edited by Edmund; 12-23-2012 at 03:37 AM.
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  #8  
Old 12-23-2012, 02:14 PM
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Is this something that could be handled by me or should it be taken to a MBZ mechanic? I did change the fan and regulator on our 1990 - 300E but found that the tear down job was quite time consuming, a lot of things to remove just to get to the part.
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  #9  
Old 12-23-2012, 02:32 PM
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did check on the fan operations and it does work great
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  #10  
Old 12-26-2012, 01:51 AM
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Quote:
Originally Posted by phillipj View Post
Is this something that could be handled by me or should it be taken to a MBZ mechanic? I did change the fan and regulator on our 1990 - 300E but found that the tear down job was quite time consuming, a lot of things to remove just to get to the part.
It will take a few hours.
It will be faster to just replace the faulty regulator with a new/secondhand one and will give you full fan speed control again but this is also the most expensive alternative.
Bypassing the regulator altogether will be very cheap but will only give you the fan at maximum speed.

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