Assuming this is only happening in the summer, and it is just water, you have a plugged AC condensation drain.
If the wetness smells like coolant you have a leaking heater core.
a leak
Your incoming fill water may be hard.
an increase in precipitation
It could be low water pressure or a partial blockage in an inlet valve.
This is known as a tsunami.
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Please fill the ewer with water.
if its the same as the 1988 van, i presume it is you should find it in on the passenger side footwell step into the van.. have a look!
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Backflow from the sewer or drain pipes.
It could be low on water and stuff, fill it.
One of the most common causes is that if some else uses water in the household, say to fill a kettle or to water the garden, then your pressure will drop as the water comes from the same inlet.