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2002 ML320. Wife just bought it last week. Trying to get the AC working. This is behind my control center next to the radio. Apparently, there's supposed to be a tube connected to that round intake part in the middle but I can't for the life of me find the tube that supposed to connect to it. Could it have fallen WAY into the dash?

2639400
 

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2002 has infrared temp sensor built into AAC controller. Red dot in center wheel. There is no need for the hose.
 

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Ooo.. I'm fairly new to this. AAC controller?

Thanks :/
Oh, wait that infrared looking dot at the bottom middle of the middle dial below the radio? I just replaced that whole unit because the switches weren't working at all; now I can get the air blowing and all with the replacement switch, but the AC is still blowing hot.
 

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Oh, wait that infrared looking dot at the bottom middle of the middle dial below the radio?
Yes. :)

What are refrigerant low/hi pressures? Codes in AAC module? Actual values in AAC module?

See:
 
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