Very LOUD engine cooling fan is constantly running on HIGH
03-14-2018, 05:22 PM
#1
Junior Member
Thread Starter
Very LOUD engine cooling fan is constantly running on HIGH
Hello forum community! I'm brand new to The Forum. I have a 2015 F150 XLT. The last 2 days the engine cooling fan has been stuck on HIGH, and it is VERY LOUD. Its so loud that I can hear it well from inside my house.
At all times of day, with AC on or off, remote started or started with the key... once it's cranked, after 3 or 4 seconds the fan goes into hyperdrive and sounds like an airplane. There are no squeaks or thumps. I'm sure this is what the engine is supposed to do, but only after redlining the engine for hours on end. My F-150 does it upon a cold start.
I've seen many posts about this, but I haven't seen any common fixes. Is there an answer out there???
Thanks,
RTS
At all times of day, with AC on or off, remote started or started with the key... once it's cranked, after 3 or 4 seconds the fan goes into hyperdrive and sounds like an airplane. There are no squeaks or thumps. I'm sure this is what the engine is supposed to do, but only after redlining the engine for hours on end. My F-150 does it upon a cold start.
I've seen many posts about this, but I haven't seen any common fixes. Is there an answer out there???
Thanks,
RTS
03-14-2018, 09:08 PM
#4
Senior Member
Welcome, hope you find a solution soon.
03-14-2018, 09:32 PM
#5
Senior Member
WHen my 13 did it, they replaced a relay and the complete fan assembly.
03-15-2018, 04:32 AM
#6
Super Moderator
Welcome to the forum !
Share a pic of the truck.
Share a pic of the truck.
03-15-2018, 09:03 AM
#7
Senior Member
Swap it
Find the relay list in the owners manual and identify the fan relay (s). It will be in the fuse box under the hood. The relay used is the same as many others in the fuse box. Just swap another, non critical relay of the same type into the slot and see if it stops running. Non critical would be a light or trailer power relay or similar. Check the manual for another to use. If the fans stop, you’ve found the culprit. I had my fuel pump relay stick off on my 09. Swapped a light relay into its place and drove home.
The following users liked this post:
digitaltrucker (03-15-2018)
Trending Topics
03-16-2018, 01:11 PM
#9
Junior Member
Thread Starter
Hello ALL,
I'll upload a pic of the truck asap. Thanks for the welcome! And tcp2, thank YOU again for the coaching. I just left advanced auto parts to see if by chance a code had been popped, but .... no luck there.
Another symptom that has presented itself is that my AC is blowing warm air. Now I don't know if this started at the exact same time my fans got stuck on hyperdrive, because until today it's been chilly in Charleston, SC. Coolant level is perfect, by the way. This is too cook of a truck to have that terrible fan noise!
RTS
I'll upload a pic of the truck asap. Thanks for the welcome! And tcp2, thank YOU again for the coaching. I just left advanced auto parts to see if by chance a code had been popped, but .... no luck there.
Another symptom that has presented itself is that my AC is blowing warm air. Now I don't know if this started at the exact same time my fans got stuck on hyperdrive, because until today it's been chilly in Charleston, SC. Coolant level is perfect, by the way. This is too cook of a truck to have that terrible fan noise!
RTS