anyone no much about fiesta zetec heater faults its a w reg one heater always blowing cold has a newish heater tap on it so its not that! both pipes to the tap are hot and one pipe to the heater matrix is hot when u check the voltage at the heater tap plug its battery voltage on cold then as u go to hot it starts to fuck about has anyone came across a heater switch fault before? im guessing the switch is just a resistor p.s spelling and grammer police dont bother replying im after info not a school teacher!