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W163 ML 270 CDI facelift A/C problems, blow only hot ait.

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Old 04-26-2021, 06:27 AM
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ML 270 CDI 2004
W163 ML 270 CDI facelift A/C problems, blow only hot ait.
Hello everyone. I have that problem. I changed the A/C module from middle but same problem. Blow only hot Air even if the fan set 0. Sometimes it work after i disconnect the battery for the night. Maybe AAM fail? Or battery?
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Old 04-27-2021, 03:01 AM
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What do you mean by A/C module? Post a photo.
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Old 04-27-2021, 03:04 AM
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Originally Posted by Maj. Dundee
What do you mean by A/C module? Post a photo.

That one.
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Old 04-27-2021, 04:42 AM
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That is not the problem. 95% of the time it is a faulty Blend Door Motor which is under the instrument panel.

I am going to work shortly and will return in the afternoon and will assist you then.


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Old 04-27-2021, 04:46 AM
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Originally Posted by Maj. Dundee
That is not the problem. 95% of the time it is a faulty Blend Door Motor which is under the instrument panel.

I am going to work shortly and will return in the afternoon and will assist you then.

But sometimes it work well.
Blend door motor fail if the fan Still blowing hot air after i set the fan to 0?
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Old 04-27-2021, 05:25 AM
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You must scan for codes in the AAC Control Module for code B1201,
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DTC AC as of 2002.pdf (56.8 KB, 152 views)
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Old 04-30-2021, 04:01 AM
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Originally Posted by Maj. Dundee
You must scan for codes in the AAC Control Module for code B1201,
Hello. I was remove the A/C control panel and its still blowing hot air. Still the Blend Motor fail?
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Old 05-01-2021, 03:58 AM
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Originally Posted by Lovász Viktor
Hello. I was remove the A/C control panel and its still blowing hot air. Still the Blend Motor fail?
But did you scan for codes?
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Old 05-01-2021, 11:48 AM
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Originally Posted by Maj. Dundee
But did you scan for codes?
Yes. Here it


Last edited by Lovász Viktor; 05-01-2021 at 11:50 AM.
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Old 05-01-2021, 01:18 PM
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Your code B1201 shows that the Blend Boor Motor is faulty, just like I previously said.
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Old 05-01-2021, 01:22 PM
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Can i somehow turn of the fan?
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Old 05-03-2021, 05:55 AM
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Originally Posted by Lovász Viktor
Can i somehow turn of the fan?
Do you mean the Radiator Cooling Fan or the Blower Motor fan?
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Old 05-03-2021, 05:56 AM
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Originally Posted by Maj. Dundee
Do you mean the Radiator Cooling Fan or the Blower Motor fan?
Blower motor fan.
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Old 05-03-2021, 08:46 AM
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Originally Posted by Lovász Viktor
Blower motor fan.
Are you saying that the blower motor stays on all the time?

When to turn the key off, does it shut off?
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Old 05-03-2021, 08:47 AM
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Originally Posted by Maj. Dundee
Are you saying that the blower motor stays on all the time?

When to turn the key off, does it shut off?
Yes. When i turn off the key its shut off. But when i drive i cant.
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Old 05-03-2021, 09:37 AM
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Originally Posted by Lovász Viktor
Yes. When i turn off the key its shut off. But when i drive i cant.

Did your front carpets get wet at any time?

In the mean time, remove fuse #4 in kick panel fuse box.


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Last edited by Maj. Dundee; 05-03-2021 at 09:44 AM.
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Old 05-05-2021, 11:27 AM
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Originally Posted by Maj. Dundee
Did your front carpets get wet at any time?

In the mean time, remove fuse #4 in kick panel fuse box.

Thanks. Removing Fuse is stop the fan.
I can change the heat manualy if i move the Blend motor. Can it cause the AAM or anyway the Blend motor fail?
And no. Never get wet.
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Old 05-06-2021, 06:10 AM
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Originally Posted by Lovász Viktor
Thanks. Removing Fuse is stop the fan.
I can change the heat manualy if i move the Blend motor. Can it cause the AAM or anyway the Blend motor fail?
And no. Never get wet.
You have two problems. You have to replace the Blend Door Motor and a new Blower Motor.
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Old 05-08-2021, 11:33 AM
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Like this one?
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Old 05-08-2021, 01:17 PM
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Post your vin#.
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Old 05-08-2021, 01:28 PM
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Originally Posted by Maj. Dundee
Post your vin#.

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Old 05-08-2021, 02:38 PM
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If I were you, I would replace the resistor which is attached to the Blower Motor.



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Old 06-07-2021, 09:40 AM
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Changed the Blend door but same problem.
And i have this panel. Is this the resistor?

Last edited by Lovász Viktor; 06-07-2021 at 09:45 AM.
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Old 01-16-2023, 11:10 AM
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I have the same exact problem. Changed the resistor and the AC controls and still, blower motor always on full speed and always just hot air...

My car throws the 1202 blend door code as well but what I'm trying to fix now is the blower motor always on full.
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