I have a seat altea 1.9tdi 54 plate 1.5k on clock. One day its stoped givin out hot air. So i bled the matrix an a bit of warm air cum out i have bled the system no air in it. I had my mini cam to c the vents an all workin fine i onley get heat if the revs are about 3grand but the pipes in the pasanger kik board one is hot the over cold any help please (sorry for spelling)