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The grille at the base of the windshield collects water and directs it down through ducts in the door pillars for discharge underneath. The ducts can become clogged with debris, causing water to back up and leak onto the floor. The ducts have to be cleaned, often by using a tool improvised from a wire coat hanger, to break up the debris - something you owner's manual doesn't mention.
First.... are you sure it is "water"??? If it is, the likely source is condensation dumping out of your air conditioner system.... which is normal. Also, you need to remember that the air conditioner operates for other reasons than just cooling the passenger compartment in the heat of the summer. In many vehicles, the air conditioner also runs during the operation of your windshield defroster. Therefore, some water dripping on the floor of your garage is normal. BUT, if it's engine anti-freeze (or some other fluid) we're talking about, that's a whole horse of a different color..
Could be the drain tube is partially clogged. It is usually located on the fire-wall or down towards the floor pan under the car. It is usually close to where the A/C lines go thru the fire-wall. About 1/2 inch diameter sticking straight out but may have a 90 degree elbow pointing down. Also, its been extra hot and humid all over and moisture could be freezing inside the unit when on MAX A/C, then suddenly melting when switched to normal. This opens the outside air door and allows warm/hot air into the unit instead of recirculating the cold air inside the car. The drain may not be able to handle a large, sudden quantity of water. Perform a "driveway" test. Open the hood, start engine and run the A/C on normal with the windows or doors open. Locate the drain tube by looking for water dripping. Once located twist 2 or 3 pipe cleaners together and verify the tube is clean. Then close the doors/windows and switch to MAX A/C. Check for water dripping. If it stops dripping, water is freezing inside and now you know why!
caused by water running out the drip line and not falling off the drip hose due to improper angle.Water will run back down the lower outside of the hose and into the cabin.
Fixed my T&C by putting a tight rubber O ring on the engine side of the drip line neat the tip. Water will hit the O ring and drip off properly.
check the exit of the air conditioner. maybe is blocked. and instead of taking the sweet out of the car, is dripping inside. that is easy to do, and the exit of the air conditioner is usually visible on the engine side of the panel.