I got in my car this morning, and there was water in the floorboard of the passenger side. I checked to see if there was a leak, but as far as I can tell, it looks like the water is coming down from the bottom of the dashboard. Then i went to turn my heat on, and defrost and it made a hissing noise, wasent coming out of the vents properly, and the defrost was not working as well as it usually does. I dont know whats wrong, and it just started this morning.
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If you have a sunroof it could be the drain that follows the front pillar letting out under the front fender. These hoses are known to plug and crack open releasing water into the floorboards.
Driver side door check along top and front edge for tears or twisted looses sections. Internal to the door water can drain down along the window and is released outside the door seal. If the bottom of the door has the opening that releases the water plugged then water will drain over into the floorboard.
There could be a number of issues at work here. First, and most important is to address the source of the wet floorboard on the passenger side. Get you fingers wet and then rub your fingers together. Does the wetness feel a bit more slippery than just water? Smell it. Does it have a bit of a sweet smell? If so, this could be coolant leaking from the heater core into the passenger compartment. Slow leaks will take a while to notice in the coolant level. If this is the case, replacement of the heater core will be necessary. The wetness could also be just rainwater coming in from an open firewall plug, damaged door seal, or perhaps windshield seal, where rust or a poorly installed replacement could result in leakage. Now about the heat. First, is the engine coolant reaching operating temperature? Run the vehicle for at least ten minutes. Then feel the upper and lower radiator hoses. Both should be hot. If not, you may have a thermostat issue that is keeping the coolant from getting warm enough to produce sufficient heat. If the hoses are hot, then check both the supply and return heater hoses to the heater core. They should both be hot as well. If not, then a clogged heater core is usually the culprit. You may be able to get lucky and back flush the core, but most times replacement is required. If everything to this point has checked out OK, then it is likely that the blend door in the heater control box is inoperative and will not divert the cabin air through the heater core. This is hard to determine as it is all under the dashboard and sometimes difficult, if not impossible to see. Check the control head vacuum lines for cracks and breaks. Look at the vacuum actuators and ensure they are operating and that their linkages are connected as move freely. Repair or replace any problems found.
Check under the hood along the firewall, below the windshield around ac evap. and drain area. This is a common place for water to enter and flow by various means (duct system) to passenger rear floorboard as well as slight passenger side front...but usually noticed in passenger rear floorboard.
a couple things to look at if it has a sunroof the sun roof would have drain hoses that run down in each corner next you need to look at the cowl this is the section in front of the windshield that has a drain on it as well if you find nothing there the next step would be to remove the seats and carpet and sit in the car while running water over it either way you should remove the carpet and make sure it is dry all the way threw or mold will start to grow and you will never get ride of it not good for your heath other key spots to look at is if the windshield was ever replaced it could be a poor seal
If you have a heater core leak, your coolant will be low. Another issue could be the drain tube for the A/C. This will be on the engine side, coming out of the fire wall, in front of where the passengers feet would be. Make sure the drain tube is clear of dirt, or bee's nests.
is it only when the ac is on? there is a pan under the ac unit that has a hole in it to allow the condensation to empty. if that hole gets plugged it could cause the condensation to build up and back into the inside of that car. i unplugged mine and floor stayed dry