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Joined: Aug 2003
Posts: 2,086
Campfire Regular
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Campfire Regular
Joined: Aug 2003
Posts: 2,086 |
First on race day 
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Joined: Sep 2010
Posts: 2,132
Campfire Regular
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OP
Campfire Regular
Joined: Sep 2010
Posts: 2,132 |
TECHNICAL SERVICE BULLETIN
Poor A/C Performance And/Or Engine Cooling Fans Running Continuously 21-2250
01 September 2021
Model:
Ford
2015-2020 F-150
2017-2020 F-Super Duty
2018-2020 Expedition
Lincoln
2018-2020 Navigator
Issue: Some 2015-2020 F-150, 2017-2020 Super Duty and 2018-2020 Expedition/Navigator vehicles may exhibit poor air conditioning (A/C) performance, loss of airflow and/or engine cooling fans running continuously from high A/C pressures. This concern may be from the evaporator freezing up due to the evaporator temperature sensor being biased. To correct the condition, follow the Service Procedure steps to replace the evaporator temperature sensor.
Action: Follow the Service Procedure steps to correct the condition on vehicles that meet all of the following criteria: As Ironbender pointed out, you're sure handy to have around. Thanks 99, Im gonna try replacing that Evaporator Temperature Sensor, and see if that does the trick.
"Ignorance is acceptable, because you can remedy it with knowledge and research. Stupidity is when you guard your ignorance."
Ted Nugent
"Idolizing a politician is like believing the stripper really likes you."
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Joined: Sep 2009
Posts: 42,119 Likes: 8
Campfire 'Bwana
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Campfire 'Bwana
Joined: Sep 2009
Posts: 42,119 Likes: 8 |
Paul.
"Kids who grow up hunting, fishing & trapping, do not mug little old Ladies"
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Joined: Jan 2006
Posts: 69,485 Likes: 18
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2006
Posts: 69,485 Likes: 18 |
Find the relay that controls the cooling fan. The fuse/relay panel diagram is in your owner’s manual. Swap it with another relay of the same ampacity that is known good. Start the truck with a cold motor and if the fan does not come on, the relay is stuck “on”. If it’s stuck on, replace it.
That’s the first thing I would check. I would think that the relay wouldn't click on unless there was power coming from the sensor. There shouldn't be any with a cold engine.
“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell
It's not over when you lose. It's over when you quit.
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Joined: Aug 2002
Posts: 4,168
Campfire Tracker
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Campfire Tracker
Joined: Aug 2002
Posts: 4,168 |
The solution to that problem identified by the TSB is one that I'm sure would be very, very hard to find by a normal mechanic.
And the people who animate for King of the Hill have absolutely no idea what an engine compartment looks like. Sheesh.
It takes a village to raise an idiot.
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Joined: Nov 2007
Posts: 6,967
Campfire Tracker
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Campfire Tracker
Joined: Nov 2007
Posts: 6,967 |
Find the relay that controls the cooling fan. The fuse/relay panel diagram is in your owner’s manual. Swap it with another relay of the same ampacity that is known good. Start the truck with a cold motor and if the fan does not come on, the relay is stuck “on”. If it’s stuck on, replace it.
That’s the first thing I would check. I would think that the relay wouldn't click on unless there was power coming from the sensor. There shouldn't be any with a cold engine. That’s not necessarily true. Relays can stick. The sensors provide the signal for on and off. The power to run the fan is not the same conductor as the signal conductor. Otherwise there’s no reason to have a relay.
Mark
NRA Life Member
Anytime anyone kicks cancers azz is a good day!
~Molɔ̀ːn Labé Skýla~
Oh The Drama!
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Joined: Sep 2009
Posts: 42,119 Likes: 8
Campfire 'Bwana
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Campfire 'Bwana
Joined: Sep 2009
Posts: 42,119 Likes: 8 |
The solution to that problem identified by the TSB is one that I'm sure would be very, very hard to find by a normal mechanic.
And the people who animate for King of the Hill have absolutely no idea what an engine compartment looks like. Sheesh. Yep, only knew about it because, we've had 3 though the shop since fall & o1 of my tech's is ford trained. **To prove out, hook up a/c gauges to check pressures - the high side will be "through the roof".
Paul.
"Kids who grow up hunting, fishing & trapping, do not mug little old Ladies"
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 17,527 |
The solution to that problem identified by the TSB is one that I'm sure would be very, very hard to find by a normal mechanic.
And the people who animate for King of the Hill have absolutely no idea what an engine compartment looks like. Sheesh. Any real mechanic should know the fan is triggered by a temp sensor..
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