I have replaced 3 blower motors and resistor. a lot of water leaks into the blower motor after it rains I am the original owner the car has never been in accident
water leaking in on pass side on 1997 Ford Escort
sounds like a water leak at the cowl area.you will have to remove the wiper arms and the platic cowl panels and use body seam sealer to re-seal the seams on the body.verify where it leaks with a water hose and a friend to look when you are wetting the area.good luck!
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usually water in passenger floor board is almost always the heater core. if you don't want to replace or can't yet. take the to hoses running it to it off and either block them off or run them to eachother using piece of pipe that'll fit into hoses and use the hose clamps to seal