Firstly, there is no heater valve on this model . Ford stop using them in 2002. Some of these Fiesta models have an electrically operated blind system in front of the rad . If it has one , make sure it is opening. The rad should be hot all over . Best way to check for any blockage is to remove the rad and lay it flat on the floor and fill it with hot water. There should be even heat across the core . Worth a try.
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