Dust and Dirt on Rear Window Fix - TerrainForum.net: GMC Terrain Forum
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post #1 of 27 (permalink) Old 05-27-2019, 08:23 PM Thread Starter
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Dust and Dirt on Rear Window Fix

I have heard a lot of complaints of dust and dirt accumulating on the rear window of the Nox. On my last square back car I fixed that by putting on an air scoop to draw clean air over the roof to keep the rear window cleaner.
There is nothing available for the Nox but I believe I have found a simple solution. By raising the rear spoiler a bit it turns it into a scoop.

In my first test I raised it half an inch. The string test on the highway showed with no scoop the air flow over the window upwards. When opening the half inch gap I the air flow now went downwards. A very good sign.

I found a dusty road and did a 2 minute ride with the scoop closed and open. You can see from the pictures the difference.
I am going to check the water movement the next big rain storm. I am then going to try raising it to one inch. I have found the more clean air forced down over the window the better.

My main concern is not dust but salt spray and snow in the winter. So far test look positive.
If any one wants to try it the modification is simple . Just remove one of the screw from the spoiler and pick up 7 longer ones at the hard ware store with a bunch of washers to raise the spoiler.
Before winter I will be getting stainless steel hardware and double seal all the already water proof connectors with silicon sealer just to be safe.

If any one else is brave enough to try this let me know how it works.
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post #2 of 27 (permalink) Old 05-27-2019, 10:58 PM
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What do you think of the visual of the gap ? Can it be seen in normal viewing ?

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post #3 of 27 (permalink) Old 05-28-2019, 12:19 PM
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How is the spray from window washer fluid too? I would think it would hit less of the area of glass or further down by the rear wiper blade too.

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post #4 of 27 (permalink) Old 05-28-2019, 12:52 PM
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How did you raise it?
Any added air flow noise inside the cabin? I wonder if highway fuel economy would be reduced with potential added drag.

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post #5 of 27 (permalink) Old 05-28-2019, 02:37 PM
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On my two early Ford Broncos 82 and 88 these had no wings on the rear to keep the snow and dust from accumulating. After installing a wing spoiler on the 88 it did a great job of keeping snow and dust off but what it did do as well which was not expected was create a sandblast environment and before long the paint was being removed and the bare metal exposed. Needless to say I removed the wing and had the tailgate refinished. I am not saying that will happen here but both my wifes Terrain, my brothers 19 equinox and my 17 suburban have all kinds of dirt in the rear from normal driving. I think its just a result of the negative pressure back there when the vehicle is in motion.
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post #6 of 27 (permalink) Old 05-28-2019, 03:14 PM
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Quote:
Originally Posted by Silversn95 View Post
How did you raise it?
.

In post # 1 he said longer screws and stacks of washers.


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post #7 of 27 (permalink) Old 05-28-2019, 04:19 PM
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Quote:
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In post # 1 he said longer screws and stacks of washers.
Guess it helps to read every word

Another concern then would be corrosion unless the washers and new screws have comparable plating to the OE fastener. I had an issue on my old Explorer liftgate where Ford used cheap screws to hold down the chrome applique above the license plate. The screws rusted badly and left a nice stain on the paint below. I had them replace with better fasteners and the liftgate refinished and the issue never came returned.
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post #8 of 27 (permalink) Old 05-28-2019, 06:47 PM
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Just use nylon, Delrin, or some other inert washer. No corrosion . . . no chemical interaction.

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post #9 of 27 (permalink) Old 05-29-2019, 10:09 AM Thread Starter
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Some of the washer spray is lost in a cloud of mist behind the vehicle but it still works fine.

I am probably getting a bit worse gas mileage . Probably why it was not designed this way. Remember the main corporate design criteria is fleet mileage so they can sell more vehicles. (Just look at auto stop/start and active noise cancellation (to allow lower engine RPM). Both added for minuscule gas mileage improvements not customer satisfaction.

No change in cabin noise.

A 1/2 gap is hardly noticeable. When I try 1 inch it may actually look like I added a sporty spoiler (which it really isn't)

First test in light rain and not a drop of water on the rear window at 60 mph. Still waiting for a big down fall with a lot of mist off the tires to see if it collects.
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post #10 of 27 (permalink) Old 08-27-2019, 08:14 PM
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I'd love to try this... I opened the hatchback and I see 6 torqx screws, 3 on each side near the edge. I took those out and could move the "spoiler" slightly on each side but I don't see how it comes off or how to raise it. You mentioned 7 screws, is there another one, say in the middle? I don't see it but that's nothing unusual.

Thanks

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