How to keep the inside rear quarter glass from fogging up during rain or cold weather

[DeloreanJoshQ]

What have some of you done to keep the inside rear quarter glass from fogging up during rain or cold weather? It definately hinders rear vision....

I have used anti-fog spray in the past, but with not-so-great results....
The rear window of course keeps warm from the engine heat and the defrost isn't needed I have found...

Thanks!

Josh Q

[Farrar]

I will apologize in advance for not being much help but pitch in with what I know regardless.

I gave up on anti-fog products as I've never had them work. I use a shower squeegee and a whiteboard eraser to clear the rear quarter panel glass while the engine warms up. By the time I am done, it's warm enough back there to prevent it from fogging up again. The squeegee and eraser fit in the cubby hole.

Sorry.

Farrar

[DeloreanJoshQ]

When we were in Detroit for the Woodward Dream Cruise we drove through rain. As the rain started the windows began fogging up as we were driving...
I was hoping for a solution to prevent this from happening without having to pull over and clear the glass off....

[Farrar]

Ah. I've never had that happen to me. Never mind, then.

Farrar

[DMC3165]

What have some of you done to keep the inside rear quarter glass from fogging up during rain or cold weather? It definately hinders rear vision....

I have used anti-fog spray in the past, but with not-so-great results....
The rear window of course keeps warm from the engine heat and the defrost isn't needed I have found...

Thanks!

Josh Q

I have just decided to live with it as a "DeLorean-ism". One of the few not so great points about using the D as a daily driver. However once the motor gets fairly warm even in the rain i found that it works somewhat like a defroster in clearing off the side glass. However this week has been absolutely dreadful with 3 solid days of downpours. Again another reminder to get a another car and stop using the D daily!

[dmc6960]

This winter I plan to seal up the side vents in the engine cover when I do some soundproofing. I'm also adding some weatherstripping to seal the rear vents to the equivalent vents in the louvers. The insulation and removal of the vents which directly heat the quarter glass will either significantly improve the occurrence of fogging, or make it horribly worse. I'll report my findings when I have some.

[DeloreanJoshQ]

This winter I plan to seal up the side vents in the engine cover when I do some soundproofing. I'm also adding some weatherstripping to seal the rear vents to the equivalent vents in the louvers. The insulation and removal of the vents which directly heat the quarter glass will either significantly improve the occurrence of fogging, or make it horribly worse. I'll report my findings when I have some.

Are you adding insulation to all of the underside of the lower engine cover(except the rear vents) to make it more sturdy and for noise suppression?

I'd definately be interested in seeing if this solves the problem!

[jmettee]

I have used anti-fog spray in the past, but with not-so-great results....


Ditto. Rain-X Anti-Fog (if it's even still on the market) did not ever work well for me. As for Rain-X for rain....used to use it all the time & loved it. not sure why I stopped using it.


This winter I plan to seal up the side vents in the engine cover when I do some soundproofing. I'm also adding some weatherstripping to seal the rear vents to the equivalent vents in the louvers. The insulation and removal of the vents which directly heat the quarter glass will either significantly improve the occurrence of fogging, or make it horribly worse. I'll report my findings when I have some.

My guess is your effort will be extensive to get all things to work right & you'll spend a small chunk of change to prove nothing. However, it would be interesting to see what you find out. The theory makes sense, but I think there is a lot of heat & airflow back there that will be hard to control. Good luck & be sure to post results.

[TTait]

I used to use anti fog in the 80's and it worked well, but have not touched it since - maybe there is an improved formula, like Sudafed PE!

Mine fog up too, not that it rains that often here, but I don't notice it as much as I am using multivex side mirrors - I get a great line of sight with them, and only rely on the rear view for what is actually dead behind me.

[dmc6960]

Are you adding insulation to all of the underside of the lower engine cover(except the rear vents) to make it more sturdy and for noise suppression?

Bingo!

Not sure exactly what I'll use to cover the vent openings, but the underside will get a treatment of a resonance reducing layer (Dynamat eXtreme), then a 1-2 inch layer (whatever fits above the engine) of high-temp acoustic foam with a mass damper and reflective foil coating. Basically the best acoustic underhood insulation one can get. When it comes to the rear vents, they already line up perfectly with the vents in the bottom louvre slat. Sealing the gap there between the engine cover and louvers would then eliminate all direct heat and sound sources in the void between the louvers, engine cover, and quarter panels. My original goal was to reduce sound bleed through the rear window. Reducing quarter glass fog will hopefully be a secondary benefit. I can always recreate the problem driving fast through a puddle, so as long as it rains afterwards I can do a good test.

[nofear365]

Lifehacker.com had a thing about anti-fog remedies. Apparently washing your windows or mirrors with shaving cream does the trick. I've never tried it personally but many chimed in agreeing.