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Turning on rear vents for AC

Goodtohave

Member
Mar 16, 2019
403
266
Canada
I noticed that the rear AC vents worked when someone was in the back seat but otherwise couldn’t manually turn it on.

I often have my dog in the back so wanted to figure it out.

At first I thought it was the occupancy sensor but it is just the seatbelt...so buckle it put AC on Auto and it works (not on manual)

Maybe everyone knows this but wanted to share...
 
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swaltner

Active Member
Oct 13, 2012
1,651
1,707
Kansas, USA
As @Tz00 alluded to, you need to Owner's Manual (page 104 of the 2019.16.1.1 version - the Adjusting Climate Control Settings section)...

Screen Shot 2019-07-09 at 9.56.05 PM.png
 

Goodtohave

Member
Mar 16, 2019
403
266
Canada
Sounds like a faulty sensor. This says the seatbelt is at least one sensor:
Turning on rear vents for AC

Might try fooling with the seatbelt and see if that rationalizes your rear A/C.


Nothing is faulty if no one is in the back the vent does not turn on so I buckle a belt and it turns on the vent when I drive with my dog in the backseat .

Not sure why everyone thinks something is wrong and is arguing...

It is just any easy way for me to turn the rear vents on, dog jumps in I buckle a belt.

Thought I would share that’s all.
 

dsvick

Closed
Jun 10, 2016
2,198
2,281
NE Ohio
Nothing is faulty if no one is in the back the vent does not turn on so I buckle a belt and it turns on the vent when I drive with my dog in the backseat .
Mine come on without the seatbelt being buckled, my dog is big enough to trigger the seat sensor though so maybe that is enough to let the car know someone is back there.
 
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jjrandorin

Moderator, Model 3, Tesla Energy Forums
Moderator
Nov 28, 2018
12,414
14,784
Riverside Co. CA
Nothing is faulty if no one is in the back the vent does not turn on so I buckle a belt and it turns on the vent when I drive with my dog in the backseat .

Not sure why everyone thinks something is wrong and is arguing...

It is just any easy way for me to turn the rear vents on, dog jumps in I buckle a belt.

Thought I would share that’s all.
Does pushing the button to turn on the vent as detailed in the manual by the person who posted it not work? Genuine question, I dont have people in the back (or pets) so i dont use that feature but I did read about it.

What I am asking is, DONT go in the back and buckle the seatbelt in... simply push the button on the climate screen indicated in the manual (#5 in @swaltner 's post above). Does that not work?
 

Goodtohave

Member
Mar 16, 2019
403
266
Canada
It must be a combo of both the seat belt and occupancy sensor.

Rear vent was off, clicked the belt it turns on, maybe it knows your belt was clicked before the car woke up?

Who knows, it can be a bit random...But if I buckle when the car is awake it seems to turn on.

Dog loves the air in her face :)
 
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StealthP3D

Well-Known Member
Dec 12, 2018
10,585
92,071
Maple Falls, WA
I feel like I only seen this work when I have had it set to Auto.

That's correct, when the A/C is set on "Manual", the rear vent is controlled by the rear vent on/off button, when on auto, the rear vent in the front console armrest blows cold air when it senses people are in the back.

However, I did notice a nice flood of cold air comes out underneath the two front seats even when the rear air conditioning is turned off. I *like* having cool feet. Does everyone's Model 3 do this as well or is mine broken? I do like the cool air but I'm not sure if it's supposed to work this way.

Test conditions:

A/C on manual, mid and lower airflow enabled, fan on setting "7".
 
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Kind of like the thermostat in my house, hardly touch it.

I get in clients cars, super high end in the winter the heat is set at 36 degrees C, so odd.
When I picked up my old car after having service done, or when I get in a rental, the AC is always set as cold as it will go with the fan on high, like that's going to cool it down faster. People have a misunderstanding that they are affecting the temperature of the air being blown.
 

ElectroScoot

Member
Aug 28, 2019
46
74
Nevada
I noticed that the rear AC vents worked when someone was in the back seat but otherwise couldn’t manually turn it on.

I often have my dog in the back so wanted to figure it out.

At first I thought it was the occupancy sensor but it is just the seatbelt...so buckle it put AC on Auto and it works (not on manual)

Maybe everyone knows this but wanted to share...
Thank you!
The weight sensor does not detect my toddler in the back seat so I ALWAYS have to manually turn on the rear vents. This is a good work-around (for those of us that use AUTO climate).
 

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