Hi all , New to the site and would like some advice, I have a focus 1.8 zetec 2004 and i am having problems with the side vents getting very little air blowing through them . i have changed the resistor and the heating control cables and still very little air , all the vents are clear of any debri . they used to work fine but i am stumped as to what could be the problem . The car heats up fine . Does any one know what could be the problem ?