Tempstar furnace 11 years old, on third blower motor, replaced "O" rings between blower unit and furnace and made sure drain line is clean and still getting water under unit.

Do I need to replace another blower unit?

Water problems can be very costly to a homeowner... water can derive from a lot of things... dirty coil, wrong amount of air flow, charged incorrectly, a p-trap not installed when needed... save the headache of water damage and call a service tech... hope this helps...