yeah, don't rest until you've found the source of the water
water can pool up on the engine bay side of the firewall at the circled location. if you drill a small hole going from the engine bay out the wheel well, that will allow water to drain out rather than pool up and defeat the blower motor seal.
the HVAC gasket is another known culprit, as well as the windshield seal. don't forget to replace your hood seal, as that's your first line of defense against rain pouring into the engine bay.