Active Grill Shutters - 2017+ Chrysler Pacifica Minivan Forums
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post #1 of 10 (permalink) Old 02-25-2017, 08:01 PM Thread Starter
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Active Grill Shutters

Does anybody know how the active grill shutters on our cars work? I wondering how is it controlled? and how do you know if it's working or not?
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post #2 of 10 (permalink) Old 02-25-2017, 08:14 PM
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The shutters close at high speeds to provide better aerodynamics. It happens automatically. There is no manual control or indicator.

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post #3 of 10 (permalink) Old 02-25-2017, 08:48 PM
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Yeah I was going to say air causes them to shut creating a vacuum suction like effect that draws them close. Not sure. Would have to research.

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post #4 of 10 (permalink) Old 02-25-2017, 09:18 PM
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Originally Posted by Gohawks1224 View Post
Yeah I was going to say air causes them to shut creating a vacuum suction like effect that draws them close. Not sure. Would have to research.
I think they're closed with an electric actuator that gets activated when the car decides it doesn't need as much air for the radiator and engine.

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post #5 of 10 (permalink) Old 02-25-2017, 09:18 PM
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Not chrysler specific, but this might help explain them. From the research on various dodge vehicles, the repeating word, "car variables would open or close shutters" was repeated. This video demonstrates those car variables.
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post #6 of 10 (permalink) Old 06-17-2017, 07:17 PM
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I found this diagram of the shutter in the Pacifica, but it does not match what I see in the car.


(The shutter is item 25.)

I do not see this shutter. I can plainly see a large radiator, what I assume is the A/C radiator, right behind the front intakes.

After looking at the engine compartment a bit, I'm mystified about the airflow. There are obviously two large intakes in front, above and below the main bumper beam. But how does the air get out?
* It doesn't go out the bottom. There is a belly pan covering all of that. The belly pan is probably a big part of getting road noise and drag coefficient down. Apparently a third of a vehicle's air drag is typically on the belly.
* Not much goes over the windshield. They've gone to some trouble to seal that gap.

The only openings I found were in the wheel wells, around where the suspension bits connect to the wheels. Those openings are smaller the intakes. That's backwards. Air expands and increases it's viscosity as it heats up, so on airplanes the exit vents are typically larger than the intakes.

If anyone gets a chance to actually see the shutters, I'd appreciate it if you could post a picture.
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post #7 of 10 (permalink) Old 06-17-2017, 08:07 PM
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Does anybody know how the active grill shutters on our cars work? I wondering how is it controlled? and how do you know if it's working or not?
The motor actuates the shutter between full open and full shut (depends on initial position) every time you turn the car on (to establish open/shut stop limits). If it finds it is stuck, it tries 3 times to cycle and, if temp is above 40 Deg F, you get a MIL light/code. The powertrain control module communicates with it via a LIN (local) bus and a control module and motor both mounted on the shutter assembly controls it. It can improve engine warmup times and open as necessary to manage temperatures. Otherwise it is shut above a certain speed. This is from hybrid service manual.
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post #8 of 10 (permalink) Old 06-18-2017, 05:55 PM
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The motor actuates the shutter between full open and full shut (depends on initial position) every time you turn the car on (to establish open/shut stop limits). If it finds it is stuck, it tries 3 times to cycle and, if temp is above 40 Deg F, you get a MIL light/code. The powertrain control module communicates with it via a LIN (local) bus and a control module and motor both mounted on the shutter assembly controls it. It can improve engine warmup times and open as necessary to manage temperatures. Otherwise it is shut above a certain speed. This is from hybrid service manual.
cool so in theory, we can watch it upon startup.

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*Ordered 1FEB and delivered 20MAR2017

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post #9 of 10 (permalink) Old 06-18-2017, 08:47 PM
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cool so in theory, we can watch it upon startup.
Yep. This makes me think of the old TV commercial where the toddler has stuck oatmeal in the VCR.
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post #10 of 10 (permalink) Old 06-23-2017, 01:12 AM
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To satisfy my curiosity, we need someone to video the actuation...
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