hi guys,i still have no heat in my 53 plate coop s,i have just taken off the plastic cover in the passenger footwell to have a look at the matrix to feel if it is cold..ie blocked,which it wasnt,its nice and hot??...now i did get a lot of brown water out of my rad when i took it off to do the s/c oil.....so i was thinking of changing my rad and matrix in case they were totally blocked,but if the matrix is getting hot,it cannot be blocked??..right or wrong??..also someone suggested it could be the control flap getting stuck??..where is that???..can anyone help please...winter wont be long and i will be needing some heat??