Thank you for taking the time to share your insight and the excellent picture. Pardon my delayed reply, and being new to this forum as well. I was on the my.chevrolet.com page and searched accessories, seeing the Lund part number 19368979 as being offered. I then went to autoanything and began to read reviews.. with the common issue of windows stopping due to the impact apparently on the rough surfaces you mentioned, and some making mention of them shattering.
Have you, or are you willing to share insight as to the best way to prep them and install them to reduce this issue? I greatly appreciate your taking the time to do so if possible.
Very disappointing that this is a problem, as I have rain/vent guards on virtually every vehicle I own. We are having a very hot temp issue having to leave the windows up and we also have the Panoramic roof, even with the shade closed, I am sure adds to the heat build up.
I am fairly adept at modifying things, and would value your experience being shared. As a side note I have an 87 Buick Grand National we performed a frame off back in 2014, along with many other detailed upgrades during the process. Also an Astro Van with 485,000 original miles that has fed my family for 27 years.. I know how to make things last. Good day to you sir.
Yes, I can share a few installation tips for a successful install.
The first step is to get the window channel clean enough for the double faced tape to bond. The supplied alcohol wipes proved insufficient; I used a clean rag wrapped around a putty knife, saturated with rubbing alcohol to clean the channel more thoroughly.
Then test fit the visors without removing the film from the tape, just to see how they will go into the channel. Then you can remove the tape backing and install the visor.
The most important and overlooked part of the instructions is:
The tab on the visors that mates with the B pillar, the one that doesn't have tape applied, is supposed to fit between the rubber window channel and the outer B pillar plastic trim. (not in the window channel); the window hits the visor when raising because of insufficient clearance in the channel for the visor and window combined.
The method I use to assure that the window doesn't hit the flange of the visor when initially raising the window is to use some old plastic gift/credit cards as a guide.
I put the window up close to the installed visor, place a plastic card into the track between the visor and the window both on the front and rear of the window; then carefully raise the window all the way up. The plastic card/guides then can be removed to use on the next window.
After the window is up fully, examine the position of the visor to assure it's where it belongs. If not, lower the window, re-position the visor and repeat the install. They won't stick right away, so they can be moved if out of position.
After they are in the proper position and the window is up; do not lower the window for a couple of days, so the tape's adhesive will bond properly.
If you just put the visors on and raise the window without some precautions such as the plastic card/guide trick; you can almost be assured that the window will hit them and potentially break them.
There is also the option of installing the external mounted, tape on visors that are also a Chevy accessory provided by Lund. I just prefer the looks of a channel mounted visor.