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  #1  
Old 04-05-2015, 10:34 PM
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Dusty back window

2015 Grand Cherokee: I have a fairly long, dusty driveway. It takes only once to get my rear window covered with dust, even driving very slowly. I'm wondering if anyone has used mud flaps, or a modified spoiler to try to keep the dust from the back wheels from getting sucked up over the window. No other car I've owned has this problem.

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  #2  
Old 04-06-2015, 12:51 AM
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Re: Dusty back window

There is a dirt road near our family camp and my rear window gets covered with dust too, and I have the Mopar mud flaps. Mud flaps are pretty much just for keeping rocks, dust, and spray down for cars behind you and to help reduce rock damage under the car. They might help a bit, but I don't see a huge difference with the Mopar mud flaps. It's why we have a rear wiper.

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Old 04-06-2015, 04:00 AM
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Re: Dusty back window

I think that's just the way it is and that there isn't a lot that can be done to prevent it.

To get a bit scientific, the wing across the top of the rear window is there to improve aerodynamic performance and create a clean edge for the air passing over the car to break away from. A by-product of this is a kind of turbulent wind pocket travelling along behind the car that will encourage dirt to stick to the rear window. This will be the case with most wagon shaped cars—especially the modern ones with a rear window wing. The only real way around it is to own a sedan.
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Old 04-06-2015, 07:29 AM
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Re: Dusty back window

Quote:
Originally Posted by matt-chops View Post
I think that's just the way it is and that there isn't a lot that can be done to prevent it.

To get a bit scientific, the wing across the top of the rear window is there to improve aerodynamic performance and create a clean edge for the air passing over the car to break away from. A by-product of this is a kind of turbulent wind pocket travelling along behind the car that will encourage dirt to stick to the rear window. This will be the case with most wagon shaped cars—especially the modern ones with a rear window wing. The only real way around it is to own a sedan.
Or you could install a rear window air deflector..
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Old 04-06-2015, 08:36 AM
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Re: Dusty back window

Have you ever experimented with traveling at a faster/fast speed on the driveway--to get away before the kicked-up dust has a chance to settle?


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Old 04-06-2015, 11:19 AM
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Re: Dusty back window

Quote:
Originally Posted by matt-chops View Post
I think that's just the way it is and that there isn't a lot that can be done to prevent it.

To get a bit scientific, the wing across the top of the rear window is there to improve aerodynamic performance and create a clean edge for the air passing over the car to break away from. A by-product of this is a kind of turbulent wind pocket travelling along behind the car that will encourage dirt to stick to the rear window. This will be the case with most wagon shaped cars—especially the modern ones with a rear window wing. The only real way around it is to own a sedan.
Thanks for the comments. I'm not a big fan of using my rear wiper for dust and dirt out of concern of scratching the glass. I prefer to use the wiper to clear rain or dew, not dirt.

The rear window air deflector is what I'm wondering about. But the "wing", is where the deflector, or spoiler, should be. The "wing" across the top of the window may in fact improve aerodynamic performance, but on most cars, like my 2005 Toyota Highlander, that wing has a slot between it and the car's surface, which I believe serves to channel air down over the window and reduce the amount of dust that settles there.

As an old fighter pilot I know a little about aerodynamics, and I believe the slot would also add to aerodynamic performance by reducing the turbulent airflow over the top of the wing.
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Old 04-06-2015, 11:26 AM
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Re: Dusty back window

This issue isn't limited to the JGC...it's actually pretty common with many SUVs and CUVs because of how air flows over and around the back-end. I had an '06 Highlander Hybrid Limited prior to my JGC and it wasn't much better, honestly...maybe slightly, but not significantly. (My driveway is about 350' of modified stone and the same is true at the barn where we board our horses...so I have to deal with the dust, too)
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Old 04-06-2015, 03:55 PM
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Re: Dusty back window

Quote:
Originally Posted by PlayGolf69 View Post
Thanks for the comments. I'm not a big fan of using my rear wiper for dust and dirt out of concern of scratching the glass. I prefer to use the wiper to clear rain or dew, not dirt.

The rear window air deflector is what I'm wondering about. But the "wing", is where the deflector, or spoiler, should be. The "wing" across the top of the window may in fact improve aerodynamic performance, but on most cars, like my 2005 Toyota Highlander, that wing has a slot between it and the car's surface, which I believe serves to channel air down over the window and reduce the amount of dust that settles there.

As an old fighter pilot I know a little about aerodynamics, and I believe the slot would also add to aerodynamic performance by reducing the turbulent airflow over the top of the wing.
I haven't seen any aftermarket units available yet that would replace the rear wing with one that sacrifices a teeny bit of drag for some air ducting that blows air down across the rear window to help keep dust, etc. from accumulating there so bad.

Worse, I have yet to find a touchless car wash that can get the top 2-3 inches of the rear window clean after a long trip on dusty roads, or worse, sand from leftover winter road treatments.

Doesn't collect just dust, does a pretty good job of collecting snow, sleet, etc. and mudflaps as some have noted don't help a bit.
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Old 04-06-2015, 03:56 PM
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Re: Dusty back window

Quote:
Originally Posted by mannichine View Post
Have you ever experimented with traveling at a faster/fast speed on the driveway--to get away before the kicked-up dust has a chance to settle?


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Higher speed makes it even worse--on freeways/highways with leftover winter sand.
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Old 04-07-2015, 07:03 PM
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Re: Dusty back window

Its called wind swirling vortex, all cars do it. the little spoiler above the hatch area cuts it down, but does not stop it. It cuts down on drag, does not eliminate it. Thats why you get the dust.
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Old 04-07-2015, 08:24 PM
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Re: Dusty back window

I remember ordering my "new" 2004 JGC Limited and springing for the rear air deflector that "helps to keep the rear window clean of dust and snow". Also still have a 2004 Overland too with no deflector- on the Limited the air deflector was and is worthless. My 2015 Summit has the same issue; you would think that it would be figured out by now.....


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Old 04-08-2015, 07:52 PM
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Re: Dusty back window

You can always install an aftermarket window deflector, here is an example picture, I had one like this on my old hilux surf, it screwed to the rear spoiler, it essentially takes air from the front along the roof line and deflects it so that it blows down the back window into the vortex area, thereby eliminating the swirl and picking up dust.

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