Hello. Welcome to FixYa. Please allow me to help out here.
Yes, there is a hole under the wiper motor. This is where the heater/defroster gets fresh air from.
If you are getting water in the heater box, the drains that keep the water from backing up, and entering the hole, are blocked. You will need to have the cowl panle removed, and any debris under the cowl removed and cleaned out.
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The wiper motor is extremely slow and seems to have just one speed setting. Does this mean that the transmission motor is starting to seize up? Can it be cleaned up and with new grease put into it reinstalled? Or should I put a new one in or maybe a rebuild?
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