Moisture in cab

[pirate]

Hi all,
I'm new to the forum since I really haven't had any trouble with my truck until recently. I am getting a lot of moisture on the inside of my front windshield on the colder morning we have been having in the northwest. I have not left any windows open during the rain but anytime in the morning when I get in the truck I need to dry off my window. Anyone have any ideas of cause or are experiencing the same problem?

 

[bigdodge]

Third brake light seal. Huge problem with these trucks.

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[WhiteExpress]

I would certainly check / reseal the 3rd light. I know I have had issues on 3 rams and my F150 with this same thing.

 

[ramrocker]

For sure check out replacing the 3rd brake light with the MD EPDM seal.

Out of my 3 vehicles, the Ram usually collects the most moisture inside the cab.
Has done it since brand new.
No leaks that I can find, just seems to collect more moisture.

When my Ranger's steering wheel leather felt moist, I tracked it down to leaking 3rd brake light seal.

Doesn't help Houston area has lots of +90% humidity days.
Rain earlier today and 100% RH, 58°F at the moment,

 

[pirate]

Thanks all, the 3rd light gasket will be replaced today and we'll see if that works.

 

[shootur44]

Might also check heated core.

 

[TonyMM]

Might also check heated core.

What do you mean by that?

 

[shootur44]

That should have been Heater core in dash. They can leak and the moisture will collect on windshield I got a 2009 3500 4x4 dully Resitol and it’s doing same thing.


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[TonyMM]

I understand.

How do you check these? How to you access to these?

 

[ramrocker]

Couple of links on signs of leaking heater core:
https://thehappycar.com/5-signs-heater-core-busted/
https://axleaddict.com/auto-repair/Whats-Wrong-With-My-Car-5-Signs-its-your-Heater-Core

MotorCityMechanic

 

[BTD07]

Id start with the third brake light and go from there. For the life of me we couldnt figure out why my wifes Jeep had moisture every morning inside until one day I was detailing it and found a Boveda pack I had dropped in it, which is for cigars and puts out humidity, and it was hiding in a crevice. Once I took it out it went away. For added protection I threw a couple of silica packs in it just to maintain it from getting moisture inside again. Could always be something that simple. Cant believe how much it drove me crazy before finding it