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Ice and/or dew on the inside means there's moisture inside the cab. (duh) "Favorite" leak locations include the third brake light, front door seals, possible HVAC leaks under the passenger side dash.
I get the same thing in my 05 F150 from time to time. I also get a little windsield rattle when it is really cold out as i heard the seal will shrink in the cold weather and leave a little gap. This is where I also assume the moisture is leaking through but have never really narrowed it down.
"the seal will shrink in the cold weather and leave a little gap"
What?! The last time I remember seeing a seal was on an original style VW bug. Just about every maker sets the windshield on a sealant bead...kind of glued the vehicle. Or are you talking about the rear window?
"the seal will shrink in the cold weather and leave a little gap"
What?! The last time I remember seeing a seal was on an original style VW bug. Just about every maker sets the windshield on a sealant bead...kind of glued the vehicle. Or are you talking about the rear window?
Sorry I didnt say sealant bead, but yes this "sealant bead" may shrink in cold weather, cause rattle and possibly let some moisture in if not sealed properly. Not saying this is the issue but I was just trying to offer a suggestion to the original post.
A few things that can help dry out the inside of your truck:
- Run the heating system on defroster the foot/defrost blend most of the time. That'll use the A/C to dry the air.
- If you park in a heated place (warm garage, shop or parkade) make sure you let the warm moist air out when you drive away. Assuming it isn't actually raining, the cold air outside in winter will be much less moist than the warm air inside a heated building.
- If you park somewhere cold that is a little protected, or if you are sure it won't snow that day, leave one or more windows open an inch.
The last two hints both basically work on the same premise, warm air holds more moisture than cold air, so let as much cold air circulate in your truck as possible. Of course, that's wasier to do out here in the dry west than some places, but it's worth a shot.