Best Way to Defrost Windshield???
 

Stupid Question Time:
What's the fastest way to defrost the windshield in your 911??? Fresh air + heat both toward the windshield with the driver's side window slightly cracked is my technique, but it leaves much to be desired. Thoughts?

db

Footwell blowers if you don't have them make a big difference.

First, clean glass is hard to fog. I mean really clean. If it's really clean, fog has a very hard time forming. I live in a rain forest, by the way.

Cool air seems to work better than heated air. Later, heated air works well to warm up the glass and prevent fogging later on in the drive. But in the first fifteen minutes, your best bet is probably to not direct heated air past the glass. Only cool air.

And yes, cracking a side window makes a huge difference. It draws considerably more air past the glass.

Get your defrosting system up to spec -- but keep a clean cotton rag in the glove compartment.

Keep one of these "handy"http://forums.pelicanparts.com/uploa...1102707861.jpg

Use my heated front screen :cool:

I don't think there really is one sound way - the HVAC of the 911 is a cluster at best.

Kinda like the ergonomics as the years have went on. The engineers just kinda stuck a button here or there wherever it would fit.

In 84 as an attempt to assist with the defrost issues, they included heating elements incorporated in the glass that ran about 7-8 inches up from the bottom of the glass. this worked like the rear defroster elements in the rear windows.

These are very fine "hairlike" elements that are hard to see in the daytime. At night they can be seen very well when light shines on them.

As far as it solving the issues - it was a poor attempt at best.

-Jeff

Nice Tag ;)

RainX on both sides of windows

I'm guessing the one you tried wasn't fully functional as mine works perfectly.

Chamois.

Squeegee, but you might have to give her a lift.:)
http://www.dh-artworx.com/badtoyv8/carwash.jpg
Link to a frosty VW van story:
http://www.wrybread.com/WryRoad/mecasa/vanglorious5.shtml

Probably depends on the year of your car. My 85 has footwell blowers that don't work but I still get very good defrost. Bottom two levers on the dash to the right and both floor levers all the way up. System heats up faster that any water cooled car I have. My 85 also has the heater blower in the engine department. This blower does work on mine but when it was broken the defrost didn't work very well at idle. If the rear blower doesn't work or motor is bad do a search there several articles on how to convert the motor as they are no longer made new. If I turn on the top lever (fresh air) the velocity of the air coming out increases but the temp goes down so far defrosting doesn't work.

The instructions in the manual work well for me:
Fresh air volume and blower off (top levers all the way left)
Middle level left (fresh air to floor)
Bottom lever right (hot air to windscreen)
Floor levers up and aux blowers on
.. and a cotton rag at hand
Putting the a/c full on can help dry the cabin air too.

The one I tried was the one on my car. I picked up my car with 23,000 miles, all original and everything working properly.

It works fine for the 7-8 inches that actually gets cleared and gets hot fromt he defroster elements coming from the bottom.

So if you want to drive slouched down peeking out thru that gap you are all set...

Again, it was a poor attempt at best.

-Jeff

The procedures John outlines are correct for defrost, but not for defog. A search would bring up comments in the past consistent with mine. And again, no one in the United States lives with more rain or humidity than we've got here. We fully deserve our wet reputation. It is raining now, and has been raining almost continually since Sunday.

For defog, you want cool air. It's fine if you don't believe me, but using the heated air during the first ten minutes of operation will fog, rather than defog, the inside of the windscreen. The best method is to crack a side window about 1", turn the fresh air on with the middle lever all the way to the right and keep moving.

Oh and again, perhaps the most important thing is to have CLEAN glass. Water has a very hard time condensing on clean glass.

I'm not sure what 7-8 inches you're talking about. The elements in mine are the full length of the screen:confused: The whole screen gets cleared, indeed it has far greater coverage than the rear defroster.

Got any pics of this windshield???

If your elements go from the botom of the windshield all the way to the top yours is indeed unique.

They do go across the full length of the bottom of the windshield, but again the elements only come up from the bottom for about 7-8 inches. Actually shorter I think.

-Jeff