The fact that its getting colder and this problem has started now may be an indicator of a worn out battery. The alternator could also be failing but if the battery is still the original that's possibly the culprit. Have / can you check for proper charging with a multimeter and what charge the battery has at rest etc.
Hi guys ive changed the fuel filter on my 57 plate Mondeo 2.0 tdci. It now won't start anyone help?
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ford mondeo mk4 2.0 tdci wont start