[Ajrothm]

Anyone else in humid climates have an issue with the windshield fogging up with the AC on and in recirc mode? Seems like even with the fan speed on low and the temp setting at only 65*, I still get a good bit of fogging on the windshield. Almost like the defrost door is not closing off all the way when the AC is set to "head" and in recirc.. (Max)..

Experimenting with the defrost and temp settings, the ducts seem to change over properly and so does the temp/blend doors...however just a small enough amount bleeding through the defrost duct to fog the windshield..


Pretty annoying to have to turn the wipers on to clear the fog on a sunny day...it's done this every day that I've had it..(1 week).

Just curious if this is common or mine has an issue.. I'd hate to have the dealer tearing into the dash.

[Modshack]

Originally Posted by Ajrothm

Anyone else in humid climates have an issue with the windshield fogging up with the AC on and in recirc mode?

Turn off recirc. The heavy moisture just from breathing is not being dissipated if you don't introduce fresh outside air into the cabin..
AC does dehumidify but you have to give it some chance to exhaust the damp air. Recirc just keeps it in the car. Your breath is very moisture laden.

[Tim Adams]

All of my cars have done this for the past 35 years I have been driving. It's normal.

[raptor5244]

Originally Posted by Ajrothm

Anyone else in humid climates have an issue with the windshield fogging up with the AC on and in recirc mode? Seems like even with the fan speed on low and the temp setting at only 65*, I still get a good bit of fogging on the windshield. Almost like the defrost door is not closing off all the way when the AC is set to "head" and in recirc.. (Max)..

Experimenting with the defrost and temp settings, the ducts seem to change over properly and so does the temp/blend doors...however just a small enough amount bleeding through the defrost duct to fog the windshield..


Pretty annoying to have to turn the wipers on to clear the fog on a sunny day...it's done this every day that I've had it..(1 week).

Just curious if this is common or mine has an issue.. I'd hate to have the dealer tearing into the dash.

I noticed it as well when I first picked up my car. It was very humid that night but I have not see it again yet. I think there is a mode the does defrost and AC, which may help instead of having to use the wipers every few minutes.

[Johnman]

When I read the title to this thread, I knew you were in or near Houston!

[ctrlz]

Originally Posted by Ajrothm

Pretty annoying to have to turn the wipers on to clear the fog on a sunny day...it's done this every day that I've had it..(1 week).

Just curious if this is common or mine has an issue.. I'd hate to have the dealer tearing into the dash.

So you are getting condensate on the EXTERIOR which must be cleared by the wipers? This is because the glass is cold and the outside humidity is high. Redirecting airflow off the glass should help. In recirc mode your duct temp is probably in the 50's once the system runs a bit. That is pretty cold air to blast directly at the glass.

[Ajrothm]

Originally Posted by ctrlz

So you are getting condensate on the EXTERIOR which must be cleared by the wipers? This is because the glass is cold and the outside humidity is high. Redirecting airflow off the glass should help. In recirc mode your duct temp is probably in the 50's once the system runs a bit. That is pretty cold air to blast directly at the glass.

Exactly right. That's why I was questioning why I'm getting air flow through the defroster to the windshield when in theory, it should only be coming out of the forward facing dash vents.. (Head vents). I can feel a very slight amount of air coming through the defrost vents, even with the fan on the lowest setting. None of my other cars have ever done this..

Guess I'll have to play with somethings like turning off recirc like the other poster mentioned.

[Ajrothm]

Originally Posted by Modshack

Turn off recirc. The heavy moisture just from breathing is not being dissipated if you don't introduce fresh outside air into the cabin..
AC does dehumidify but you have to give it some chance to exhaust the damp air. Recirc just keeps it in the car. Your breath is very moisture laden.

Good idea and easy enough to try.. It's humid and rainy out today, I'll turn off the recirc for the drive home and see if it helps. Thanks for the info.

[Ajrothm]

Originally Posted by Tim Adams

All of my cars have done this for the past 35 years I have been driving. It's normal.

It's weird, none of my cars have ever done this, even my 71' Vette that has Vintage Air and only has recirc (no outside air entry) doesn't fog the windshield, and it blows 37*.

I think this is more due to the fact there is air coming up out of the defrost vents when it shouldn't be.

The fog pattern on the outside of the windshield is exactly at the place on the glass where the air from the defrost vent is coming out...

[Texas 6Gen]

Originally Posted by Johnman

When I read the title to this thread, I knew you were in or near Houston!

+1

[BreedsAS]

Originally Posted by Johnman

When I read the title to this thread, I knew you were in or near Houston!

Sucks because NTX and DFW have had Dallas type humidity the whole month!

[Sidedraft]

This has happened to me in every car I've owned. It's always humid here, though.

[Wheel Team 6]

Originally Posted by Ajrothm

Anyone else in humid climates have an issue with the windshield fogging up with the AC on and in recirc mode? Seems like even with the fan speed on low and the temp setting at only 65*, I still get a good bit of fogging on the windshield. Almost like the defrost door is not closing off all the way when the AC is set to "head" and in recirc.. (Max)..

Experimenting with the defrost and temp settings, the ducts seem to change over properly and so does the temp/blend doors...however just a small enough amount bleeding through the defrost duct to fog the windshield..


Pretty annoying to have to turn the wipers on to clear the fog on a sunny day...it's done this every day that I've had it..(1 week).

Just curious if this is common or mine has an issue.. I'd hate to have the dealer tearing into the dash.

I picked mine up Tuesday of this week. I noticed it while we were setting up the OnStar account idling. I'm here in humid Florida and it's annoying so I made an appointment with my dealer next Saturday to fix it. Will reply here when I find out what the fix is.

[Ajrothm]

Ran mine on the way home with the recirc off, it actually fogged up worse.. It was 85*, 95% humidity and raining. Trying to run the defrost and AC at the same time obviously did not help as if blew even more cold air on the glass. Once I went to defrost, put the temp at 80*, it finally cleared the fog off... But it got hot in the car quick.

Pretty annoying for sure.