Condensation in windows

usually that means the car has some water or moisture inside the cabin. Check the trunk take the hatch out like most Prius you have a leaker.
I assume it lives outside no garage?

 

Gen2 Prius have leak problems, but Prius C do not... Perhaps you or a passenger spilled some water? Out here in the PNW we're more humid year round than near anywhere else in US, so it's easy to grow mold inside a Prius.

Had that problem with a car that was sitting here for a while so I put my 60 pint home dehumidifier in the car and plugged it in and it dried out real fast.

 

I don't know if this translates to the C model, but I've seen a few Gen 2's that have had taillights swapped out and become serious leakers around the tail light seal. Rain, car wash, anything that puts water over the tail lights was putting water into the trunk area.

 

Yea, saw moisture inside the 2013 Prius C lights that I detailed this weekend...

 

All G2's have leaks and many G3's on this site report leaks too. G2 is the worst. Take your trunk apart and look.

If you used after market tailights I can almost guarantee you they will leak. They need to be monitored and most fixes like Camper said require sealant. I have one in my g2 leaked real bad had to goop the hell out of it.

g2's have bad cabin leaks from cracked roof joints and other areas.

Prius trunk LEAKS pictures compilation - common problem areas. prius 2004-2015 | PriusChat

 

It's a Prius C, not a gen2 or gen3 and I worked on one for the first time this weekend. Way less places for leaks to happen compared to regular Prius.

 

This might be a plugged AC drain line.
Might also be a coolant leak in the heater core.
Any chance that a water bottle leaked or a window was accidentally left down in the rain ??

 

Start by removing all contents from the car, at least anything that can hold moisture. Paper towels, cloth towels for wiping windows, coats and boots and other winter or rain clothing, sweaty gym clothing, water bottles, even floor mats that hold tracked-in or spilled water. Dry them all out in the house or garage, or anyplace but the car. Sometimes the culprit makes itself known during this process.

Dry the car's interior as much as possible. If floor carpets are wet, soak up as much as you can. Check the trunk or spare tire space under the hatch floor for any pooled water. This process reveals some more culprits.

If these steps don't find the actual culprit, they should at least narrow down what place is most wet, helping to focus the search for body leaks.

 

Excellent points... It inspires this rant:

It always amazes me how many people have cars filled with needless junk... And not only can you keep car more dry by keeping it empty, but a methed-out smash and grab thief has no interest in busting your window if there's nothing in your car to rummage through.

I kind of think people who don't lock their doors and get robbed aren't any different then people who have lots of clutter in their car and have a window smashed due to a thief's craving to rummage through someone's stuff.

Since when did cars become storage lockers? Car are suppose to transports you, not assist your hoarding aspirations.

 

Gravity means that you see where the water goes to, where it collects, not where it comes from.

 

PS: Someone posted this thread on links for Gen2... Though it doesn't apply to your car, it might help you think of additional places to look in your Prius C Prius trunk LEAKS pictures compilation - common problem areas. prius 2004-2015 | PriusChat

 

Already post in #8

 

See reply #15... Also is that really ice? You said it was 40 degrees out?