I wonder why....

[NeilP]

I was out in the Jeep this chilly -8° morning and decided to play around with the hill descent option a bit on the way back home. I had the heater going full blast and it was not in "auto" mode. I had the air flow set to the floor only.

I stopped and put the Jeep in neutral to shift into low range and when doing so, I noticed that the HVAC switched over to recirculate (the recirc light didn't come on). I shifted back to D and the HVAC switched back to outside air. Shifted to P and the HVAC went back to recirculate.

Apparently it is designed to switch from outside air to recirculate based on the position of the gear selector. What is the benefit of this???

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[Ratbert]

Maybe to try to keep fumes from building up?

 

[NeilP]

Maybe to try to keep fumes from building up?

Possibly?

 

[GATORB8]

So the Alldata process description doesn't mention the gear switch over.

I almost made a joke about it being for protecting you from Covid when parked and someone sneezes on the jeep.

That made me remember, back in 21 when we were shopping, I remember an "advanced filtration" advertisement. I'm trying to find it somewhere.

 

[GATORB8]

It was in some of the FCA stuff added in '22. "Clean Air System"
https://www.jlwranglerforums.com/forum/threads/jeeps-clean-air-system.82452/

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