Blower ?

I have 3 vent holes in the back, but air is only coming out of one vent. Is all 3 blower vents, I can only find 1 blower motor so does the tube split into 3 somewhere. 2006 outback

No, the blower is only hooked into one outlet. The others are just for looks.

Thanks I just found that out searching it in the service and repair forum, I guess I should have done that first

The other holes act as a passive flow through when the boat is moving in conjunction with the inlet air vents in the front.