Excessive condensation on windshield

Have excessive condensation on windshield, anyone else have this kind of issue? Dealer has had truck for a couple of days and they can't duplicate condensation. Can't find any leaks on from or back window. Any thoughts???

 

Roof, door seals, fire wall seals, third brake light, shark fin, rear cabin vents between bed and cab.

 

Somewhere there is excessive moisture in your truck. That is definitely not normal. Start by checking out the floor and see if any part of carpet is damp.

 

Heater core ?
I had a slight leaker in an old car before. Steamy windows.

 

That typically has maple syrup smell associated with it.

 

Probably your third brake light leaking. Known Tacoma issue. Many forums on the subject. It’s the most common thing that could cause this. Check near back seats for moisture.

 

The dealership has had it for 2 days running "test" meaning through a car wash and running hose over it. They haven't seen any leaks, but did say rear floor board mat had water on it. I've never noticed water anywhere except condensation on windshield. At least I know what questions to ask for things they've checked.

 

if the rear carpet is wet, my best guess is 3rd brake light. Or roof rack if thats new or installed incorrectly

 

Bad heater core is often the cause of excessive windshield condensation.

 

Could also be the windshield itself isn't seated properly.

 

No roof rack they said they tested back window, it's a Toyota dealership surely they would know of issues of the 3rd light should've been first on the list to check

 

How do you know if you have a bad heater core, besides condensation

 

You'd be surprised on how dishonest some dealers can be.

 

I believe it's on the driver side just above the gas and brake pedal on these 3rd gens

 

Don't even get me started!! It's an 18 bought new lifted with 33s on it, 2 wks later front left control arm bolt fell out while I'm DRIVING DOWN THE ROAD unfortunately not going very fast or I would've gotten paid haha sense then issue after issue after issue!!! I know all those guys up there and they're all full of it and because I'm a female that knows how to work things they think I'm an idiot. LOVE TOYO'S but not this dealership for sure!!!

 

Often, damp P/S carpet and bad smell after it get's bad.

 

Toyota thinks we are all idiots/ sheep.
Btw if you mention this site, they most likely will treat you as a leper.

 

Nothing like that going, I mean I haven't been in the back checking carpet constantly just because I immediately assumed it was windshield leaking. Why else wouldn't other Windows be showing the condensation

 

Lol they already do. I just always tell them I know guy or my uncle then they "listen" (smile and nod and tell me I'm pretty haha)

 

Thanks for all the suggestions at least I know when I get my truck back and they haven't figured it out I have some places to start trouble shooting at. Still not clear on how to tell if the heater core is bad but I'm sure I can find it on here.