Heated front screens were a big deal Ford thing in the '90s[possibly earlier?]the early ones were-to me-like looking through a wire fence!Nowadays they're much improved in that respect.Be aware though that on modern Fords at least if the car is used mainly for short journeys and the battery begins to fall below certain parameters due to not recovering enough charge the car will begin to shut down "non-essential"systems like the heated screen or heated seats in order to give the car the best chance of starting.
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