i broke my heater casing. blows heat but none of the plugs work or anything. how do i fix it just replace it?

 

by plugs you mean vents? if thats the case it should be a easy fix. i havent done it on my yota but i have with other cars and its just screwed on or bolted on in a few places and the cover should drop out. just goto the junkyard and swap it out.