I recently got this truck and don't know much about it except it was a 1 owner truck. The problem I am having is all the window get dew on them on the inside and it is making it smell like mildew. There are no apparent leaks. I owned a lot of vehicles and this is a first time, for this issue. I live in Florida and it has rained almost everyday for almost 3 weeks, so it is pretty humid out there. If it was a leak how would all the windows have dew on them on the inside? Any suggestions would be greatly appreciated. One more thing I also have a car and it does not have this issue.

 

Maybe a silly quest1ion, does your truck have air conditioning that works ?

Please keep in mind air conditioning doesn't only cool , it dehumidfies , removes moisture, from the incoming or inside air.
The moisture it removes has to have a way to exit the vehicle and that may be part of the problem.
Hear any strange squishing noises when blower is operating ?

 

At present I am working on the AC so not it is not working at present. I do not hear any strange noises when the blower is running. I am pretty close to having the AC working, I will update if that solves the problem. Thank you for your reply.

 

On the passenger side firewall there is an evaporator drain, a small flat tube that allows for AC moisture collected to drain.
Please make sure that drain is not blocked, all part of a good repair..
Let us know how you make out with this, thanks.