cheers lads,h-o-rings done BUT.........

cheers lads i,ve finished doing the matrix o-rings and could,nt have done it without your help/tips cheers.whilst i was under there i came across a little black box that the heater pipes go into(i presume this is part of the matrix) which has a cover and philips screw holding the cover on.does anyone know whats inside this cover.i,m asking this because i,ve been told that when the o-rings were leaking the coolant was running down this box and it may have let water in shorting out causing my blowers not to work?is there electrics in there.cheers craig

Is there a cable coming out of it? Is it about the same size as a fag packet?? If so could be one of the blend motors.