I have a leak coming in the passenger compartment under the floor from under the hood. How do I stop the leak?

If you are asking about coolant leaking onto the passenger side floor INNSIDE the car's passenger compartment and NOT under the hood you have a leak in either the heater core or one of it's hoses.

IF IT WAS HAPPENING ALL THE TIME WATER IN THE PASSENGER FLOOR I WOULD HAVE HEATER CORE CHECKED BUT ONLY WHEN RAINS YOU HAVE A SEAL MISSING UNDER HOOD AGAINST FIRE WALL
SOME TIMES YOU CAN BUY REPLACEMENT ONES AT ADVANCE OR AUTOZONE BUT 2000 MODEL NOT SURE

There is a drain to the hvac box under the hood passenger side. It's most likely stopped up.

It may be a leaking A/C condenser my advise would be to take it to an Air Conditioned Shop to have it checked. Good luck

the water leaking issue may have cause the blower operation issue. there is a drain for the a/c housing that comes out at the bottom side of the firewall on the passenger side of the vehicle under the hood that likes to clog up and build water in the housing. the water then runs into the blower motor causing corrosion in the motor and usually the connector at the blower melts as well. the blower is easy to change, the connector is not as easy but shouldn't be too bad. the blower can be found just under the glove box and has a 2 wire connector

Look for a hole or opening in the fire wall from under the hood.
Wire harnesses, AC lines and heater hoses usually have a grommet that closes off the air leak where they come into the passenger compartment. One may have rotted or simply pulled out. If pulled out, work it back in.
If you can get under the dash with the seat pushed all the way back, you can put a drop light under the hood, get under the dash and look for the light coming in. If you see anything.....PLUG IT!! :-)

The evaporator drain might be clogged. Get under the truck or open the hood and look for a rubber nipple coming out of the firewall on the passengers side. Try sticking something in this hole to release whatever might be stuck in there, usually leaves or sediment. Be careful, don't go crazy pocking something in there. The evaporator core might be near the drain hole, you don't want to poke a hole in it.

Hi,
I'm not familiar with your model to know if you have an engine temp guage or a light that would come on if the engine is overheated. You said the motor wasn't overheating under the hood... but you have an overheating problem? Maybe just a tad bit more info...
Are you losing coolant?
The water pump if bad, would probably leak or make terrible racket.
Just to take a shot at it, since you said it blows smoke through the dash... I'm assuming a kindof white smoke with a rather sweet smell? Have you noticed any wetness on the passenger floor at all? If yes to any of this, I would suspect as you mentioned, a leaking heater core. Hope this helps... Good luck!

Sounds like your air conditioner drain is stopped up. Shouldn't this vehicle still be under warranty?

You need to go under the vehicle and unplug the rubber drain for the a/c.The drain can somtimes be reached under the hood on the passenger side fire wall.