Your heater core is partially plugged causing water slush, if you have checked your drain plug on the evaporator heater case outlet and it is not restricted, then that is a major repair.
You may have an air bubble in the coolant system. Today's cars have a sealed coolant system and if they are not bleed right the air will be in there and you will hear the water sloshing in the heater core.
If you have the 3400, (or may be a 3500 by 05) look for the two bleeders one is to the left front and it a small bolt that you loosen. LIft the pass side of the car and let it run. The other bleeder is on top of the thermostat housing on the driver side. open both but when you see nothing but coolant coming out of the driver side, close but leave the passenger open longer. Top off the reservoir with 50/50 coolant and close the cap tight. let the pass side bleeder stay open longer. Make sure there is no air, it needs to be a steady flow of coolant before you close it up.
top off the reservoir one more time and see if that doesn't take care of the problem.
Hoe this helps
I had this happen and it was rain water in my doors. check the bottom of the door to make sure there isnt debris in the drain holes.
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