The floor on the right hand side of the car is always soaking wet. could the sunroof have a leak and
water gets in when it rains?
Sounds like you might have a heater core leaking..
Could also be the windsheild thats not well sealed
Does it smell like coolant? Heater-core. No smell? Windshield leak, sunroof drains, or AC condensate drain.
If it does not smell like coolant and there has been no body damage that could affect door or window seals, then it's probably one of three things. 1. It could be a leak from the sunroof but if it is then the liner should be wet and a seal is damaged or the sunroof drain is plugged. Look online for a video on how to fix. 2. It could be an air conditioning drain hose plugged or disconnected. Pull up the front passenger carpet and you should see a drain tube exiting through the floorboard. 3. Most likely if you have a lot of water on the passenger side floor after a rain or a wash, it's a plugged drain hole at the bottom of the windshield cowling - that part at the bottom of the windshield with slots in it. Open the hood, use your fingers to release the plastic fasteners, remove the rubber and the metal cowling, then look down in the opening near the passenger side for debris plugging the drain hole. Clean it out, reassemble, and you should be good to go.
Could just be a dirty gasket not sealing well. Clean it off with mild detergent & water. Age with these guys about clogged drain hose, too.
Meaning the square-ish sunroof gasket.
Looking for a Used Matrix in your area?
CarGurus has 1,555 nationwide Matrix listings starting at $1,500.
Search Toyota Matrix Questions
Toyota Matrix Experts