Heater not working but floor board not wet - 1992 Cadillac DeVille

Sounds like your heater core is leaking or clogged need to flush coolant system and check heater core .

Sound like a heater core, the heater core would be under your dash..Another sign of the heater core being gone, is you would notice the floor board being wet..It is possible that maybe at some point the floor board was wet and you didn't know here it came from and didn't give it another thought..But if the blower works..I would bet heater core...Or it could be a thermostate..check the thermostate first it would be the easiest.. and the cheapest..

Does it have a sunroof? Open your sunroof and clean out the drain and channels around it. Probably dirty letting water spill out into your car.

Whenever I see a system which is leaking from more than one or two places, I do a head gasket check because that tells me that the system is experiencing above normal pressures. the wet floor is a heater core. whether it's a water pump or some other thing near it only you can tell. Actually it rarely happens, but the wet floor could be the hose where it meets the heater core at the firewall; again, only you will be able to tell the difference. if the hose connection looks dry, assume that it is the core itself.

You have a leaking heater , hose es or tap. That is why you are loosing coolant. FInd the leak by using a radiator pressure tester and replace /repair unit.

passenger side floor? There is a small tube that directs the condensation from the AC to the ground.If this tube has gotten plugged or moved the water would end up on the floor. Should be able to see this tube sticking out of the bottom of the heater /ac module.

sounds like you have a bad heater core

it could be your heater core

heater-core is gone needs to be replaced

no, dry floor, check anti freeze pipe, if there is a leak bu a sealant at an autoshop and tape it up, top up anti freeze, re check for leaks, ya should be good to go