No, it's not likely to be the pollen filter (but changing it in accordance with service schedule is well advised because if the blower ends up needing replacing, it is a lengthy job). The most likely cause is the power supply to the blower which is in two parts. The bit that controls blower speed 1, 2 & 3 is behind the glove box, and Ford knows that it sometimes gets fried. Take out the glove box (check manual) and inspect the wiring. Replace if necessary (bit of soldering needed). A pain, but otherwise fairly simple task (especially if you can get the spare part from a broken car).
Neil Lewis
August 2008
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