My blower motor out of nowhere got stuck on high speed. I can adjust the temperatures but not the fan speed. Can’t turn it on or off either without unplugging the resistor. I’ve replaced every fuse and relay, as well as the resistor/module, none of which have fixed the problem.

Am I missing something here??

 

Yeah the most important part. What are you working on?????????

 

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2014 F150 XLT 3.7L Flex

strange I had put all the info in my profile but it’s not showing.

 

If it has one, a stuck High blower relay. If it is electronic, which since it has a resister doesn’t sound likely, it would be a fan speed controller.

 

Here is my story about my 2013 F150 high speed fan running all the time. I purchased the truck brand new in 2013 with the XLT trim and V8. This has been a great truck used primarily for skiing, hunting, and towing a boat. At about 60k miles the high-speed fan started running more than needed. As time went on it continued to run and increased in frequency. It would run in all conditions, cold, hot, towing, idling, with the heater on or off and with the air conditioner on or off. I took the truck to my dealer and the service check in guy was a *****. The fan was so loud that I had to turn the truck off so we could talk. He then told me that this was normal. Obviously, I argued but he continued his attitude, so I left. I then did a ton of research on many forums including this one. Based on the recommendations I replaced the fan relay switches, no luck. I took it to my trusted mechanic who replaced the freon and checked for leaks. No luck. He then flushed the radiator and the fan continued to run. I love this truck but could not stand the noise anymore. I decided to look into trading it in for a Dodge Rebel and took it back to the same dealer to get the recall, unrelated to the fan noise, fixed. At the check in the same ***** was not around so I decided to explain the issue one more time. This service guy was great. He told me that he was sure they can figure it out. They kept the truck overnight and pressure tested the radiator system and found no leaks. They called me and told me they felt the problem was the lack of coolant movement even though the water pump tested normal. They said that it was likely that one of the internal parts of the pump was not working like it should. Full disclosure I am not very mechanically inclined, brakes and plugs are about my limit. I decided to roll the dice and have the pump replaced as well as the thermostat. I still cannot believe it, but the high-speed fan is not kicking on like it was!!!! I have driven it a couple hundred miles including into the Colorado high country without any crazy fan noise!! I have not towed with it yet and will update this when I do! I hope this helps!!

 

Im having sort of the same issue with mine. Its a 2013 FX4 5.0. On fan speed 3 it rumbles so badly you can feel the vibration. On high its so bad the geat shift vibrates...actually most of the cabin vibrates. Mechanic said the blower failed....at 38k. Unreal. What should I be paying to have this replaced? Is it a simple plug and play I can do myself? They quoted me 500. I really dont have the time to run all over town getting it inspected and quoted. Thoughts?

 

I think the OP was having a problem with the blower motor inside the cabin