Anyone think the two are correlated?

The hood vents seem to clearly be causing my windscreen to fog up. Just wondering if I'm losing my mind or not.

 

i didnt think it was that functional....so if it does that.. it should be doing its purpose...nevr had this in my stang.. probably cause i have it partially blocked by JLT hood vent inserts.

 

Does it fog on the inside or outside? I have noticed when I run my AC that there will be a fog on the inside of the windshield next time I get in the car. It fogs enough that water will collect enough to run down the inside of the windshield leaving trails after it dries. I know it is fresh because I clean the glass very regularly. Does not seem to happen if I do not run the AC when I drive the car. There was another thread on this issue but we never really came to a conclusion as to why it happens.

 

It's on the inside, as I can turn on the defroster and it will go away, but I have to go back and forth between defroster on and windshield fogging up slowly as I drive slowly. If I'm at highway speed it's not an issue.

 

I have the same issues, a friend with a '13 has the problem as well. Must be a design flaw some where maybe?

 

what I do is make sure I turn off the top vent (disengage, whatever) and just have it set to floor vents before I shut off the car. that usually keeps me from getting in to a car with fogged up windshield.

 

I had a thread on this while back, search "does your mustang get hot inside?". It took me some time until I realized this is a common issue on our cars, the weekend warriors who only drives when the weather is nice will probably not notice as much.

Although the hood vents does 'vent' hotness out in some degree, our coyote engines tend to get quite hot - in heavy traffic or stand still at idle - you will get tremendous amount of heatwave coming inside the cabin unless a/c is left on.

We need those subzero inter-coolers

 

This is a notorious issue with Ford's going way back. Yeah, I'm old. In my old job I drove many different Ford's in the 70's, and 80's, and even way back in the dark ages they did the same thing. Just like my '13 Mustang.

 

^This took care of my fogging-up issue.

 

Yep my 04 GT did the same thing.

 

ForgotMyUsrname, my first question would be, have you selected the a/c to blow through your defroster vents? Check your settings. The large center button can be pushed several times to select various air routes. Check your owner's manual to see what each button does when it is illuminated. You'll want the middle (dash vents) or bottom (floor vents) or a combination of the two illuminated. If the top selection (windshield defroster) is illuminated, that's your problem. You don't want defrosters blowing ice cold air. The engine bay heat hits your cold windshield and causes interior and sometimes exterior condensation.

 

I'll disagree with you here. I have had seven other Mustangs, none of which had the issue.

 

I cut out the hood blanket, "rain catcher," around the vents to let out even more heat, and I still don't have this problem.

 

After you did that, are you having any issues during rain with cai.

 

I have just noticed this same issue. It typically happens in the evening when I make a trip to Walmart or some place. But my fogging is on the OUTSIDE of my windshield. I did find out that the setting on the AC does have something to do with it as another poster wrote. I had it set with the top and bottom lights lit up (windshield and floor vents). When I changed this to the middle and bottom (dash vents and floor vents, the fogging disappeared. I think it's the cold air hitting the windshield and the hot air coming from beneath the hood that's causing this. I'm sorry we have this issue, but it's comforting to know that it's not only my car that's doing it.

Stay safe.

 

My C&L CAI has a water diversion design, so it stays dry.

 

mostly it is humidity and temperature reaching the dew point. Also check and make sure you are drawing in outside air through the vent system and keep the cabin air recirc off. Recirc of cabin air will mist the inside windows as it builds humidity. People tend to select max air-conditioning, in my book a no no as this defaults to internal air recirc. I never use the max air con setting for that reason.