M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

01 ML320-I SCEWED UP

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Old Jun 26, 2018 | 09:39 PM
  #1  
Brennanleroy's Avatar
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01 ml 320
01 ML320-I SCEWED UP

I was changing the switch for the Low Range and Fog Lights with the engine running. Had the AC on because its 95 outside and hotter in the car. I pulled out the radio, popped off the trim, and removed the switch.
As soon as I unplugged the harness for the switch, the AC started blowing warm air. I installed the new switch, put everything back together and checked the fuses which were all good. Aside from being an idiot and doing this with the engine running, What did I do? I didn't think this switch has anything to do with the AC system. Your help is very much appreciated. Its supposed to be 107 on Saturday.
BrennanLeroy
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Old Jun 27, 2018 | 05:50 AM
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Maj. Dundee's Avatar
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2002 ML 320 & 2006 ML500



You must now remove everything again and make sure that the WHITE corrugated hose is connected to the back of the small grille (green arrow).
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Old Jun 27, 2018 | 11:03 AM
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I made sure the white corrugated hose was attached before I put everything back together. What does the switch have to do with the AC system?
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Old Jun 27, 2018 | 02:06 PM
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Originally Posted by Brennanleroy
What does the switch have to do with the AC system?
Nothing.
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