Ok, this is starting to make me mad- my windows keep fogging up at night. I leave my mustang outside under a car cover, i live in ohio near columbus and its about 30's out right now. Every time i goto drive my mustang at night, the windows are all fogged up. When i goto wipe it off, its really watery (more than my tahoe) so i assume its condensation. This is weird to me because i leave my chevy tahoe outside and my windows in it never fog up. I dont have any insulation under my carpet in the mustang so i dont know if thats why. Also this even happens when its like 40 or 50 out. Just wondering if any of you guys have the same problem as me or if you know how to fix it. Thanks in advance.

 

Mine lives in the garage but I do know that my newer cars (07 Explorer and '04 PT Cruiser) have much better window seals, etc. to keep out humidity and moisture.

Granted on the drivers side on my Mustang I know I need to adjust the track on my quarter window but the windows leak ever so slightly if you wash it or the one time I got stuck in a sudden rain shower.

Is your car cover one that breathes? I know some of them are worse for you car then no cover due to holding in moisture.

 

Could be moisture residing in your vents or heater system. I assume you get the moisture after running the defroster? Also, how's your weather stripping, especially around the front windshield? A anti fogging product may help until you close the possible air leaks.

 

That is one of the classic symptoms of a leaky heater core.

 

Leaky heater core is one (and one that is also apt to film up the inside of the windshield with something that the defroster will not clear away).

Try driving with either the vent windows or side windows cracked a bit, especially as you are almost at the place you're going to, and try running the heater at a lower setting. Moisture content increases as the air temperature rises (coming from your breath and perspiration) and has noplace else to go when the car cools off overnight.

Running the heater air on 'recirculate' is a common cause of glass fogging in newer cars. Don't know if these earlier cars had recirc and fresh air heat options, but if they did, take it off 'recirc' once you start to feel the heat.


Norm

 

My car cover doesnt breathe but my still windows fog up when the cover is off. Also its not my heater core because i just replaced that. I'm thinking its probably the window weatherstripping because i get small amounts of water in my car after it rains, even though i replaced all the weather stripping but the front and back windows (could be that too). thanks alot for all of the replies- im going to work on my weatherstripping soon.

 

There is water entering somewhere which is causing excessive humidity. I would suspect the cowl or the sheet metal around the windows more than the weather stripping. If you can't find the leak try using a garden hose (no nozzle) around the windows and down into the cowl. Start low and work your way up.

 

Try the car with out the cover a night or two see if its the car or the cover.Could try the anti fog stuff rainx makes its not a cure but it can help.Just remember its a old car it can have a leak anywhere almost even the floor pan.

 

Exactly. You're not going to seal the car up like a new car. It's just not going to happen. The lack of a good atmospheric seal combined with a lack of insulation are going to make for a foggy interior. Also figure that if you don't have a/c, it's just not going to defog quickly. Most modern cars have a/c which dehumidifies the air, reducing window fogging. My 67fb takes forever to warm up and defog in the winter. There isn't really an easy way around it.

 

Ok, thanks alot