Rear Windows won't close all the way

[ChanceMcCall]

2016. Windows close fine when the top is down but not so when the top is up. Both rear windows fail to close all the way with the top up and it has been that way since the first time we dropped the top. Any suggestions?

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[JCFoster]

I’d try cleaning the rubber seals along the top with a silicone spray like wd40 silicon. Seals may just be dry and sticky.

 

[rcengr]

Clean and lube seems to be the most helpful. Check out the full thread: https://www.mustang6g.com/forums/threads/do-your-back-windows-not-close-all-the-way.117186/

 

[robertwsimpson]

Do you have your front windows down when you're trying to roll up the rears? I have to put my rears up first and then my fronts.

 

[ChanceMcCall]

Do you have your front windows down when you're trying to roll up the rears? I have to put my rears up first and then my fronts.

I've tried it both ways. Nothing helps. Going to try the silicone trick next.

 

[ORRadtech]

I don't suggest using silicone, it tends to dry rubber out over time. What I use, and I've had to do both sides, is dielectric grease. It doesn't affect the rubber and lasts. I did my passenger side last July and it still works perfectly. I just had to do the driver's side last week. The passenger side hasn't dried out, gotten hard or collected dirt and the rubber is still supple.
So, yeah, dielectric grease, not silicone. Just put some on your finger push it deep into the channel and rub it on both sides and use a paper towel to remove any excess. You will be pleased with the results.

 

[MButler51]

I don't suggest using silicone, it tends to dry rubber out over time. What I use, and I've had to do both sides, is dielectric grease. It doesn't affect the rubber and lasts. I did my passenger side last July and it still works perfectly. I just had to do the driver's side last week. The passenger side hasn't dried out, gotten hard or collected dirt and the rubber is still supple.
So, yeah, dielectric grease, not silicone. Just put some on your finger push it deep into the channel and rub it on both sides and use a paper towel to remove any excess. You will be pleased with the results.

My Honda dealer has long used a special grease called “Shin-Etsu” grease on my door and window seals. It IS actually a silicone grease of some kind. I know this is flat blasphemy on a Mustang site, but it’s pretty good stuff, Haven’t tried it on my Mustang yet, but same principle and I’m sure it would work great. It ain’t cheap ($26) but a little goes a long way. Amazon has it. https://www.hemmings.com/stories/2019/09/26/hondas-secret-weapon-squeaks-door-leaks-shin-etsu

 

[andyturbo2000]

WD40 with silicone. Done once this year, now perfect.

 

[sebounet]

Clean and lube seems to be the most helpful. Check out the full thread: https://www.mustang6g.com/forums/threads/do-your-back-windows-not-close-all-the-way.117186/

Does it tend to let a lot grease on the windows when you open and close them ?

 

[andyturbo2000]

Does it tend to let a lot grease on the windows when you open and close them ?

Only put the the lube on the rubber trench of the roof. Just allows the window to slip in and seal without a problem. Don’t put it on the glass itself.

 

[ORRadtech]

Does it tend to let a lot grease on the windows when you open and close them ?

No, I've not gotten much on the glass. I hardly ever see them though, they're either all the way up or all the way down, seldom in between.

 

[CS19]

Spray 303 protectant into the rubber channel and just wipe the excess off after a bit.

 

[rmxdavid]

Could this also be due to a misalignment of the top? I have tried all of the above with no luck. When this happens, I have to open my driver and passenger doors and pull both rear windows up about 3 inches. Not a big deal but would be nice if I didn't have to do it. I may have the dealer look at it given still in warranty.

 

[andyturbo2000]

Your windows have to be pulled by hand 3 inches? That isn’t right. Most convertible owners have an issue with a few mil, that’s all

 

[ORRadtech]

Could this also be due to a misalignment of the top? I have tried all of the above with no luck. When this happens, I have to open my driver and passenger doors and pull both rear windows up about 3 inches. Not a big deal but would be nice if I didn't have to do it. I may have the dealer look at it given still in warranty.

It would be a huge deal to me!

Having to pull the windows 3" by hand is not a fix you attempt for yourself if the car is in warranty.

Take it to the dealer for repair.

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