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Old 12-30-2016, 07:41 AM
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Cool Ventilation bad smell definitive solution

I have read plenty of times in many forums about the bad smell coming from the ventilation of our WK2s,
it's really annoying and it often makes my 2 years old child cough.
As I am an electronic designer of HVAC controller (for buildings), I am headed to modify the GC HVAC controller to definitely solve this issue and I will be happy to share the solution to help other owners.
I believe chemical treatments are not a solution since they will be effective for days rather than weeks, totally unacceptable.
I have been driving my 2011 diesel for three years and I can say the issue appears only during winter and not in summer.
My opinion about the cause is that during the cold season the AC pump is turned on at some time even if there is no need to cool down the cabin, this happens even if the AC button is OFF (AC button LED off).
I think the HVAC controller does some de-umidification cycles periodically or something similar which makes the AC pump turn on for a few minutes and then off.
In every car I owned, when I used to turn off the AC, I used to get that bad smell, so my abit is, in summer the AC always on and in winter AC always off. Except some rare situations this always worked fine for me.
Now the problem is that in the GC it is impossible to keep the AC always off, as the AC button in not a true on/off switch and indeed I don't understand what is it meant for since the controller drives the AC pump regardless what I set with the AC button.
I need help to locate the PWM driving signal wire of the AC pump, if it is possible to find it in the HVAC controller that would be great.
I asked my Jeep dealer here in Italy for a wiring diagram but I got only an unuseful screen print.
I hope somebody can help on this since I don't want/have no time to dismount half of my GC to see where the wires go.

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Old 01-08-2017, 04:30 PM
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Re: Ventilation bad smell definitive solution

Dismounted my GC and found out that the AC pump is not PWM, it's just ON/OFF, the electromagnetic clutch type.
When I start the engine the AC pump is turned on immediately, and it stays on even if it's cold and I ask for heating in the cabin.
On the HVAC panel there is no wire that seems to operate the AC pump, if I turn off the HVAC panel, the AC pump is turned off after 3 seconds.
I think the HVAC panel send somebody else the AC pump request via CAN bus.
I disconnected the AC pump connector and the bad smell is gone.
I am happy now I can breathe while driving .
The AC pump connector is hard to reach and operate, and I don't like to have it exposed to dirt and oxidation, so I would need to know if there is a relay or fuse I can easily remove to stop the AC pump.
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