54plate ford ka.heater won't heat blows cold air all the time?
54plate ford ka.heater won't heat blows cold air all the time? - 1
Maybe the heater-core is all corroded up.
Common problem with the Ka and Fiesta is a malfunctioning water valve that directs hot water from the coolant when you turn up the heat. Sorry do not know how to change this, does show up on here a lot though
As said heater control valve and an easy thing to replace. Located on the scuttle panel, 4 hoses in/out and a electrical plug go to it and the coolant doesn't need to be drained. It is a simple matter of unscrewing the screws holding it on, removing the hoses and plug and replacing with the new unit, replace pipes plug and screws and job done, Don't worry about air locks as they bleed themselves.
The Valve is around £45 and an easy DIY, double the price for a garage to do it, triple it if you use a main dealer.
Heater controll valve faulty 
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