Deere 3320 HVAC Blue Knob Function

   / Deere 3320 HVAC Blue Knob Function #1  

jagster936

New member
Joined
May 9, 2017
Messages
9
Location
Fayetteville, TX
Tractor
John Deere 3032e
I have scowered the internet for an answer to this and haven't found one. These tractors, including my 3320 I just got have a seperate blue and red HVAC control knob. Red controls water valve, blue controls what? It doesn't say anywhere. I have looked in user and also technical manual for the machine. It says how to adjust with a poor picture but was curious how it works so I know how to troubleshoot it or what to expect behavior wise.

It is controlling the air flow across the heater core? Only thing I can assume. I know it can't control the compressor clutch or else that would increase a lot of wear. Does anyone know? It would be obvious to any tech who has had the roof off.
 

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   / Deere 3320 HVAC Blue Knob Function #2  
On my 5 series I assumed it controlled a air damper that would blend warm outside air but I don't know that for certain. I know it uses outside air at some point because I have to clean the filters quite often. If it was recirc only it wouldn't need hose filters.
 
   / Deere 3320 HVAC Blue Knob Function
  • Thread Starter
#3  
From what I understand at least on mine and many others also the outside / inside air mix is pre set by design. Some outside to establish positive pressure and rest inside.
 

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