When is rains, I find about half an inch of water on the floor /passenger side..front. I inherited Mom's 2008 Buick Lucerne. Thought it might be a clogged A pillar ,so opened sun roof and reamed out drain hole. Next rain, same problem. Checked the rubber seal around door and even put a little strip of window rubber draft strip. nope, still water issue. It is freezing here and the half inch of water turned to ice..until the car interior warms a little. Might is somehow have anything to do with the heater core? I have had no issues with it. Once I had a 71 Dodge Dart Swinger that popped a heater core..so am familiar with how it acted. I have worked on past cars (yes...a girl). Getting older and not a fan of this car..so grumpy me is stymied.
You need to investigate by the right side windshield wiper. There is a area there which water collects and drains out from the body area. Suspect that the water level gets too high and then seeps into the right side passenger floor board area. But you need to check if its rainwater or actual engine coolant as mountainmanjoe asked otherwise your chasing your tail.
you mean leaking heater core? then it would be coolant on the floor and not water.
1. pull up the carpet/flooring and look for signs of moisture to point you to where it's trickling in from. Use your garden hose for troubleshooting.
2. Blast your air on full and use a spray bottle of soapy water on the outside to look for bubbles. (You'll have to find and seal up the vents that let air out of the cabin.) You might be able to hear whistling too. A smoke machine might help here.
3. Call someone like Leakpro
Couple of possible causes:
1. Have windshield ever been changed? What happens, bums often damage paint scraping off old butyl rubber, than install a new glass, … give it 2 to 4 years, metal rusts through, … rain water drips on front passengers toes.
2. Rust. Sheet metal above a firewall finally rusts through, you know. Leaves, road derbies, road salt collects there for years, creating perfect conditions to accelerate corrosion, … and now it leaks.
Shirt happens when cars get old!
Best,
F.S.
Check and see if the A/C/heater box drain hole is plugged.
that is a common issue, but I can't see there being half an inch of water just from condensation
This sounds like the classic heater core taking a big dump. Check all water hose connections to the core itself and run a pressure test on the warmed up vehicle with the heater on FULL (temperature setting). If the core is bad, you'll see it leaking inside the car.
she said it turned to ice ... which coolant shouldn't do.