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Rain
any leak on your drivers door, or firewall. could be just about anything.
Cracked heater core
There is a small radiator inside between the driver and passanger sides for your heater. It is probably leaking there.
more than likely the footwell would be soaked in water if the matrix was shot although they can block up from time to time and either replacement or a thorough rinse out should do the trick.
hi i have the same problem i have a vauxhall corsa 2004 and i have a little gap down the side of the window screen which is where i think the water is getting in, i think you will need to have the screen taken out and re-sealed hope this help
a
The thermostat on a 53 plate corsa sxi is in back of the water pump
Heateer Core is gone
Pour a bucket of water into the passenger footwell
you go to the mechanic
Its behind the water pump