Eliza90
2 posts
May 05, 2026
5:19 AM
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The 2009 Ford Flex uses a 3.5L Duratec V6 engine known for steady reliability in family haulers. Common problems on used units include coolant leaks from the intake manifold and occasional ignition coil failures causing rough idling. When sourcing a replacement, prioritize units under 80,000 miles from certified dismantlers. Always request a compression test and verify the VIN-stamped casting numbers match your drivetrain. Check whether the unit is from an AWD or FWD model, as configurations differ. Replacing the thermostat and serpentine belt during installation saves future labor costs and keeps your Flex running smoothly for years ahead.
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