w827da1

My Fiesta 1.25.Zetec has developed a falut with the heater.The fan works fine but I can't get any heat out of it. I've checked the voltage at the coolant valve and it shows 12v no matter what the setting is at the temperature control in the car. The car doesn't overheat but I suspect ther temperature controller. Anyone got any clues please...is it a duff controller??Unfortunately I haven't been able to remove the radio to check connections at the temperature controller.

I haven't been able to get a Haynes Manual, so need help. On a 1.24L 1998 Fiesta Zetec, where is the air filter and how do you change it please.