2009 Ford F 150 Rad Fan spining out of control?

Asked by Kevin Nov 04, 2023 at 09:26 PM about the 2009 Ford F-150 XLT SuperCab 4WD

Question type: Maintenance & Repair

My radiator fan runs on high when The RPM's get above 2000. No A/C
running. About 0 Celsius outside. Today we are on the highway the truck
started shaking like I'm driving over a rumble strip. The Rad temperature
climbed to Hot. I stop and check the rad, its full., The rad temperature drops
and all is good again. This happens a few more times I either slow down or
stop, everything resets and I'm good to go again. Drove 100 kilometers under
2000 RPM the fan never cut in and all was good the rest of the trip ? Thanks
for any help!

1 Answer
157,465

James answered 11 months ago

Possibly a bad water pump. When an engine overheats only when you're driving down the road it's a coolant circulation problem. Water pump and a stuck thermostat are the two main suspects. It also sounds like the clutch fan, for the radiator, is working correctly. When the air coming through the radiator is very hot the clutch fan will lock in to increase airflow for more cooling. Often when this happens you can hear the fan roaring, especially at higher engine speeds. When things cool down the clutch unlocks and the fan freewheels. As Ed pointed out, have this looked at before serious engine damage happens. Hope that helps! Jim

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