I have a 1992 Volante in the shop for maintenance and want to share an important simple test everyone should do before every season. Turn the blower switch on and VERIFY that air is coming out the discharge vent in the rear deck. On this boat you could hear the blower running fine, no bearing howl except there was no air coming out the discharge vent! This one required new vent plumbing from the blower to the top of the fuel tank, found (2) torn/dry-rotten areas, and one pinched closed area. When I did the new model testing for WaterSki Magazine years ago this was one of my pet peeves, about 1 of 5 new ski boats had blowers that would run but had no air discharge, usually defective plumbing and at least once per year the polarity was backwards on the blower! (we did not test a boat unless it passed basic USCG requirements)
SAFE BOATING...RonT