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Well, if the coolant is leakimg from the HVAC drain, then you need a heater core, no matter what. You really have to jack it up and look, but I can give you a couple of pointers......
1. The water pump is leaking. That happens a lot. The coolant is leaking near the front of the car, near the center, but ever so slightly towards the drivers side. You need a special tool to replace it and I think gm has an updated cover and gasket.
2. The water pump housing is leaking. The gaskets that seal it to the block are made of plastic and deteriorate often. The coolant will be leaking at the center of the car, maybe up by the water pump, or back between the engine and transmission.
3. The heater hoses. I have only seen this 2 time, but the metal pipes corrode along the fire wall.
4. You could need a radiator. I have seen the side tanks leak a few times.....
Just A couple of places to look, but you have to get under and look....
Low coolant is the usual culprit, followed by a bad thermostat. When the car is cold take the radiator cap off and check the coolant level and add as needed, then make sure overflow tank is at the correct level. If the radiator is low but the overflow has fluid, replaced the radiator cap.
Is your problem a grinding of gears? If so, sounds like synchronizers in the transmission going bad.
As for the coolant on the passenger side floorboard, hate to say it, but classic tell-tale sign of a bad heater core.
Lets address your question first. No it can't be any type of fluids from the Transmission or Engine. The reason the fluid is a brownish color is because the water coming in is washing dirt and debris into the vehicle. NOTE: If you did not notice any leak during the hot weather when your were running the A/C I'd say it's not due to the A/C System. If it were the A/C drain hole plugged up then you would here water sloshing around in the A/C housing close to the blower motor. It seems to me sense it was in the rain and we have had some really hard rain lately that's its most likely due to an outside leak. Here's how you can find the leak if its an outside leak. Close all the windows and run water over the passenger side windshield open the drivers door and get inside and see if you see water coming in, if you do that where your leak is. If you don't then move the water hose to another area and check again until you find it. Hope this helps and have an awesome day Sarah.
Please check whether you have a broken Matrix and leaks coolant as you said on Passenger's floorboard.If you have that means that you are having low level coolant and air is winning and cause bubbles. Check the matrix ( heater under dashboard.)
Here is what all dealers do to find water leaks, we spray a fine mist of water on the car near where the water might be comming in with a spray nozzle, someone gets inside the car and look for the leak, there is no other way, and I have been doing this 30 years.