2017 cooling fans running continuously

[zane]

I have a 2017 Exped XL XLT 3.5L eco boost. The cooling fans were running continuously on high almost immediately after starting the vehicle. Figured it was a faulty cooling temperature sensor or TCS…trouble is, I can’t find the thing. Can someone help me with the location on the engine? TIA!

 

[eugene11]

Hi @zane have you figured that out? My fans are on max once I start the engine and never turn off. Same year Expy

 

[rcole1228]

I have a 2017 Exped XL XLT 3.5L eco boost. The cooling fans were running continuously on high almost immediately after starting the vehicle. Figured it was a faulty cooling temperature sensor or TCS…trouble is, I can’t find the thing. Can someone help me with the location on the engine? TIA!

Did you ever find what caused this? Mine is doing the same thing.

 

[GlennSullivan]

Did you ever find what caused this? Mine is doing the same thing.

Under what circumstances is this happening? Try starting the vehicle on a cool morning with the HVAC system set to off and see what it does.

2017 Expedition Cooling Fans Loud. On High When A/C is on.

So I am getting annoyed and so far have not found a permanent solution. After start up with A/C on usually a few seconds later my electric cooling fans will kick on super hi mode. Sounds like a semi-truck. Very loud fan noise. They are working properly just kicking on in a seriously high...

www.expeditionforum.com

 

[rcole1228]

Under what circumstances is this happening? Try starting the vehicle on a cool morning with the HVAC system set to off and see what it does.

2017 Expedition Cooling Fans Loud. On High When A/C is on.

So I am getting annoyed and so far have not found a permanent solution. After start up with A/C on usually a few seconds later my electric cooling fans will kick on super hi mode. Sounds like a semi-truck. Very loud fan noise. They are working properly just kicking on in a seriously high...

www.expeditionforum.com

Sorry for the delayed response. It happens no matter the circumstances, even on a cool morning. I read that it's possibly related to the A/C high pressure switch. After more reading and looking at the A/C lines, it seems there is only a switch (referred to as transducer) on the high pressure line, none on the low pressure. Does this sound possible?

 

[GlennSullivan]

It could be the A/C pressure sensor or the coolant temperature sensor. Have you running ForScan or another DTC code reader to see if any codes are being generated.

 

[rcole1228]

I did use a DTC code reader, but no codes are being generated. I am going to change the A/C pressure sensor today and see what happens.

 

[JasonH]

I did use a DTC code reader, but no codes are being generated. I am going to change the A/C pressure sensor today and see what happens.

Have you checked the coolant levels and engine temperature? You didn't say how many miles, but the water pumps can eventually fail, which can cause the engine to run hot.

 

[rcole1228]

Have you checked the coolant levels and engine temperature? You didn't say how many miles, but the water pumps can eventually fail, which can cause the engine to run hot.

I changed the sensor/transducer, the fan no longer comes on high when the vehicle is started, without the A/C, so that's good. However, when the A/C is turned on, the fan comes on high and does not stop even when the A/C is turned off. I guess I'll be doing some more research.
The car has 93,700 miles on it. The coolant level is good and engine temp is normal, +/- 196°F operating temp.

 

[MYogurt3]

rcole1228, any luck yet? I have a 2017 Ford Expedition King Ranch EL and the fan keeps kicking on high when the vehicle is moving. I replaced the overflow reservoir and attached hose. Engine is not overheating. When I'm sitting idle, the fans are low speed. As soon as I start moving, they kick on high until I stop moving. After a few seconds of not moving, the fan goes back to low speed. This really seems to be AC related as I think the compressor runs more when the engine is at speed. Not sure if that's true, but it's a thought. I've been really banging my head on this one. I've also check the AC charge and it looks good.

 

[14expy919]

I changed the sensor/transducer, the fan no longer comes on high when the vehicle is started, without the A/C, so that's good. However, when the A/C is turned on, the fan comes on high and does not stop even when the A/C is turned off. I guess I'll be doing some more research.
The car has 93,700 miles on it. The coolant level is good and engine temp is normal, +/- 196°F operating temp.

I'm having same issue, changed high pressure switch without resolution. Do you have any ideas still?? Thanks

 

[randers9]

Hi. I have the same issue with my 2017 Expedition El xlt. I am leaning towards changing the coolant temp sensor but it looks like a pain to get to. Has anyone on here figured out any definite cause for the fans kicking on high? I mean it is 20 degrees F out and it still kicks on right after starting.

 

[dkincaid32]

Not to hijack an old thread but I had the same issue and am here to suggest a possible fix.

In my case, the AC ended up being .5lbs low on refrigerant (system takes 2.5lbs). After refilling, the fans are back to normal and only cycle-on on really hot humid days when extended idling.

 

[Dustin03]

Posting in this old thread in hopes it helps someone. I found this thread on Google trying to find info on the fan always running high.

It was the AC, in my case it was extremely low. The AC was fixed and the fan returned to normal.

Hope this helps the next guy.

 

[scbengal]

I’ll add my two cents. I thought my a/c freon needed a boost so I put some 134a in myself and that’s when the fans never stopped when the engine was running. Long story short, my mechanic told me I had put too much freon in and that caused the fans to run continuously. They vacuumed out the old freon and refilled with the right pressure of freon, it’s been a year and no problems. I’ll never top off freon again.