HI guys, wonder if you can give me some advice. ive got a 1.4 lupo 75hp and my heaters blowing cold air. changed the matrix and the thermostat but still no heat. checked all the linkages on the heater and theyre all connected fine. pipes in the engine bay are all hot aswel. bled the system, no air in it. i'm literally pulling my hair out trying to figure out whats gone wrong. any help would really be appreciated.