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Re: RAIN leaks onto passenger side floor... definitely...
Randy Ohler is probably right.
You and a buddy can try to locate the leak.
One of you (the skinny one) get in from the driver side and get down to see where water could be coming in. I'm not skinny. I would take the passenger seat out.
The other take a garden hose and riun a small stream. Starting low on the car move the steam every place you can find where water could be coming in. Take your time. Check door seals, windshield seals, and rear window seals
Testimonial: "Randy, it is a 1992 Chevy G30 cutaway van (RV).
When we first got the RV, I removed the cowling and sealed up some rusty spots under there and I don't remember any seal being out of place or anywhere water could get in at that area. I'll look again. Been fighting this leak for 5 years. Nearing the end of my patience now. If it weren't such a great running rig and very comfortable, I would have junked it long ago. Too much invested now. D Smith"
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Are you certain it is rain water? It could be condensation from the A/C coil that fails to drain out of the drain pan, or possibly coolant from a leaking heater core. If you are certain it is rain water, depending upon the age of the vehicle, and possibly some other things, here are the possible options:
Leaking door gasket.
Leaking windshield seal due to rust
Leaking windshield seal due to improper installation
Leaking windshield seal due to acoustic (sound) over pressure (if you have extreme sound system with heavy bass)
If you have a sunroof, if the drain hose comes down the passenger side door column, it could be leaking into the passenger compartment rather than drain through the floor pan.
That's the antifreeze entering and exiting the heater core, which is located behind the glove box of the dashboard. If there is sweet smell or antifreeze on the inside floor on the passenger side, you have a leak in the heater core.
1: heater core leaks. (green water) 2: A/C condensate tray drain plugged. 3: or its rain water, if rain water, the windshield cracked? 3a: the cowl is full of leaves and now the cowl vents are packed and the drains are plugged up there, (look in cowl vents) see flood?
I had the same problem with my 2001 Mercury Marquis, but it wasn't the heater core, it was the compartment for the condensate drain for the air conditioning and the compartment to catch the rain water that comes down the windshield and drains through the windshield wiper cowling. You have to take off windshield wiper on passenger side and cowling underneath the wiper of the passenger side and you will see a screen over in the corner and that's where the box is for the drain. so much trash was down in there that the flapper wouldn't open to let the water out. Ours only leaked when it rained, but it looked like it could have been the heater core. Good luck.
Do you have coolant on the front passenger floor board? When heater cores fail it will leak onto the floor board and mist coolant on the windshield. If you have a loose clamp on the heater core hose it's possible it could be leaking down the firewall into the passenger compartment. If you don't have coolant on the windshield check the clamps / hoses first.
Did you have the windshield replaced recently? This is typically caused by faulty installation of a windshield. Sometimes it can be fixed by adding windshield sealant (polyurethene, not silicone) where the windshield is adhered to the subframe - most likely along the bottom edge.
Engine coolant will feel oily and the windshield will fog up and the car will stink. If it is just water it could be coming from the passenger door weatherstrip at top. The ac drain tube , if stopped up will also leak water in the floorboard.
sounds like you have a window seal leak. The only other way water will leak into the car is a leaky heater core or a clogged A/C drain. Do you have a sun roof that could be leaking? As they have drains too.