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Has anyone noticed little extra breeze from AC when passing 18 wheeler?

Ultron

Member
Jul 5, 2019
84
192
Hattiesburg MS
At first I thought this was just a coincidence but I went on a several 100 mile interstate trip over the weekend and it happened repeatedly. But why? what's the connection between your AC, with windows up of course, and passing a 18 wheeler? Has anyone else ever noticed this and if so, what's causing it?
 

kbecks13

Active Member
Dec 27, 2017
1,914
2,263
SoCal
At first I thought this was just a coincidence but I went on a several 100 mile interstate trip over the weekend and it happened repeatedly. But why? what's the connection between your AC, with windows up of course, and passing a 18 wheeler? I can't think of any and wonder if maybe this is some kind of funny easter egg thing by the folks at Tesla. Has anyone else ever noticed this and if so, what's causing it?

Blow additional fresh, filtered air onto your face to avoid any potential outside dirty air from the truck? Totally random/kinda out there guess.

We know they have the truck detection net running and in use to hug the opposite side of a lane away from trucks, so it's not crazy to think they could apply that same logic to other things.
 

ZOMGVTEK

Member
May 19, 2015
558
433
'Merica
Presumably it’s just the increased pressure differential is effectively causing the blower to perform better temporarily. I can’t say I noticed that in other cars, but it’s reasonable to suspect it could occur in some situations when the cabin air isn’t fully recirculating.
 
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Runt8

Active Member
May 19, 2017
1,986
2,371
Colorado
We know they have the truck detection net running and in use to hug the opposite side of a lane away from trucks, so it's not crazy to think they could apply that same logic to other things.
Is this really a thing? I’ve never seen my Model 3 shy away from trucks while on autopilot.
 

Occar

Member
Jun 20, 2019
154
230
TN
Anything that raises pressure where the intake is will of course cause a bit more air to blow. If you take it through a car wash, when the dryer is on, if they cause extra air pressure in the correct place (not sure where the intake is) the vents blast you with air. I just had that happen this last weekend.
 

Petrlol

Member
Oct 16, 2018
399
537
Ohio
correct place (not sure where the intake is)

Open the frunk, remove the large plastic shroud that spans the top near the windshield. The intake is on the left hand side. Probably a good idea to shine a flashlight down in the intake and make sure you didn't pick up any leaves on the intake screen during fall.
 

lolder

Member
Jun 11, 2016
888
676
SW Florida
A recent update has the car move away from large vehicles who are passing/being passed and this movement can be felt. The airflow from the vents has inertia so it doesn't move and their relative direction is slightly changed. This effect can also be noticed when turning corners.
 

Occar

Member
Jun 20, 2019
154
230
TN
Open the frunk, remove the large plastic shroud that spans the top near the windshield. The intake is on the left hand side. Probably a good idea to shine a flashlight down in the intake and make sure you didn't pick up any leaves on the intake screen during fall.

So sounds like anything that causes more air pressure under the car will cause the vents to blow more then. That makes sense as when it happened for me was when the dryer air streams hadn't actually made it to the car yet and were probably directed under it.
 

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