Where is the Engine Coolant Temperature Sensor located?

Tiny
OL LADYL
  • MEMBER
  • 2008 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
Location of Engine Coolant Temperature Sensor and location of Engine Cylinder Head Temperature Sensor.
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Saturday, November 6th, 2021 AT 7:07 PM

43 Replies

Tiny
AL514
  • EXPERT
Hello, So Ford has these Coolant Temperature and Cylinder Temperature Sensors listed a bit strange.
The first two diagrams are for the Coolant Temperature Sensor. You'll be able to find easiest by the wire coloring. It's two wires with light green/red and grey/red wire colors.
The Cylinder head Temperature sensor you'll also have to go by wire coloring, because it's listed in 2 different places depending on how many valves the engine has, but it's always easiest to find sensors by wire colors. It also two wires, grey/red and yellow/light green. its either on the front of the engine or on the complete opposite side, on the back.
Are you getting codes for these Sensors?
Also, on some vehicles the Cylinder Head Temperature sensor is used instead of a coolant Temperature Sensor. So, it depends on what type of set up your vehicle has.
While looking up the Coolant Temperature sensor for this vehicle, it was actually listed under the Air Condition section, which is strange, but that's how I was able to find that particular sensor.
So, you may find one or the other, or both sensors.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor
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Sunday, November 7th, 2021 AT 9:40 AM
Tiny
OL LADYL
  • MEMBER
Yes, I'm getting codes for both. First check engine light came, got code for engine coolant sensor so I had it replaced. Check engine light never went out and couple days later coolant light came on, had it checked showed code for Engine Cylinder Temperature Sensor and Coolant Temperature Sensor. AutoZone sold me a ECT sensor, but it looks nothing like part Ford shows. And two Ford mechanics say there's only one sensor, not two. I'm so confused. But thank you for your help.
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Sunday, November 7th, 2021 AT 11:26 AM
Tiny
AL514
  • EXPERT
Well, take a look in those locations for those wire colorings, they're a 2-wire sensor.
It may have both, not every technician knows everything. If you are getting codes for both, the ECM is seeing something. The Ford OEM parts may look different from aftermarket parts from AutoZone. The wiring diagrams are a bit different, and everything is not always straight forward. Make sure your coolant level is full, just never open the radiator when it's hot.
If you really can't find the correct sensor and you're still getting two codes like that, call the dealership and ask their parts department why this is happening and if it's possible for the vehicle to have both. Hope this helps, let us know how you make out.
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Sunday, November 7th, 2021 AT 1:55 PM
Tiny
OL LADYL
  • MEMBER
I ll definitely give it a try. Thank you
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Sunday, November 7th, 2021 AT 5:53 PM
Tiny
AL514
  • EXPERT
No problem, if you need any other help or wiring diagrams let us know, we have about 33 Technicians here so I will put an inquiry into them about the issue and see what if they have any more information on the matter. Will repost here in a day or so.
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Monday, November 8th, 2021 AT 8:37 AM
Tiny
OL LADYL
  • MEMBER
That would be great. And I ll keep you posted on any progress.
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Monday, November 8th, 2021 AT 8:58 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I noticed it has been several days since we heard from you. Has any progress been made? We're interested in knowing.

Let us know if we can help.

Joe
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Thursday, November 11th, 2021 AT 5:10 PM
Tiny
OL LADYL
  • MEMBER
Not really. Weathers been pretty rough, work hours long so maybe Saturday.
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Thursday, November 11th, 2021 AT 5:16 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Sounds good. Feel free to let us know if there is anything we can do to help.

Take care,

Joe
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Thursday, November 11th, 2021 AT 7:01 PM
Tiny
AL514
  • EXPERT
Hello,

Have you been able to locate both of these sensors, or one or the other? I know on my ford ranger the coolant temperature sensor is in the front of the engine, more like this picture below. But I think trying to trace the wire coloring will be your best bet. I'm not sure why Ford techs would tell you it doesn't have both, if you're getting both codes. Another possibility I thought of was maybe the Engine computer (ECM) needs a software update. There always seems to be an update for software on many different vehicles. Sorry, this is such a confusing issue, I have read others saying the same thing, that Ford uses Cylinder Head Temperature sensors instead of coolant sensors. I was curious if you remember what the exact Codes numbers were, such as P followed by a number. If we have the code numbers, I can look up exactly what the criteria is for setting either one of these codes. I'm wondering also is this the Expedition "EL" model? And do you have Automatic A/C climate controls? Where you can adjust the temperature for both the passenger and driver side differently? The code numbers would really help, I would like to find out how it's outputting both codes.
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Sunday, November 14th, 2021 AT 8:57 AM
Tiny
OL LADYL
  • MEMBER
I never found the Engine Temperature Sensor. Changed the Engine Coolant Temperature Sensor. Will have to go back and get codes. It's crazy because the truck never runs hot. But with temperature sensor on it while driving at up to 190 its fine. At 192 degrees the fan starts going on and off. And the temperature gauge falls from right before half, which is where it normally stays while driving down to cold and back up again. I'm at a loss.
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Sunday, November 14th, 2021 AT 9:22 AM
Tiny
AL514
  • EXPERT
The gauge falls all the way back down to cold while driving? Is the check engine light on? Maybe you just need a new thermostat. If they get stuck partially open, it will do that, it happens all the time. Sometimes they will still be opening and closing the way they're supposed to, just not fully closing all the way. They are pretty cheap too; I will see if I can find a diagram showing its location. Al you'll need is a thermostat and a couple gallons of 50/50 coolant, Ford probably has their own type of coolant like everyone else these days. But the thermostat is usually around $20.00.
Okay, below I posted a picture of the Thermostat, and it does require Ford coolant, I'm not sure what you have been putting in so far.
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Sunday, November 14th, 2021 AT 9:31 AM
Tiny
OL LADYL
  • MEMBER
It's the 4x4 Limited. And I thought thermostat from beginning but was going by codes. I ll definitely change that out this week and see if it helps. Thank you so very much for the information.
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Sunday, November 14th, 2021 AT 9:45 AM
Tiny
OL LADYL
  • MEMBER
And yes, check engine light is on.
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Sunday, November 14th, 2021 AT 9:50 AM
Tiny
AL514
  • EXPERT
So, you have codes stored in the ECM, write them down this time so we have the exact numbers, because there can be a couple codes for one sensor depending on if it's a circuit problem, ie electrical or something else.
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Sunday, November 14th, 2021 AT 9:57 AM
Tiny
OL LADYL
  • MEMBER
Okay, will do.
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Sunday, November 14th, 2021 AT 10:26 AM
Tiny
OL LADYL
  • MEMBER
P0128 and P0119.
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Sunday, November 14th, 2021 AT 3:22 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If I hope you guys don't mind if I jump back in with you.

I looked at both of the codes that the vehicle as it is a simple issue. The engine is not reaching operating temperature within a specified amount of time. In other words, it's taking too long to warm up.

In most cases, this is caused by a faulty thermostat or temperature sensor. This is where the confusion comes into play.

Some of these vehicles came with only a cylinder head temperature sensor and others came with both a cylinder head temperature sensor and coolant temperature sensor. The only want to determine which you have is to check for the coolant temperature sensor. If it has one, it will be tucked behind the alternator and mounted in the engine block. However, most only came with a cylinder head temperature sensor, which can set the code P0119. See pic 1 below.

See pic 2 for code P0128. As far as the P0128, here is what I suggest: Using an infrared thermometer for cars, check to see if the engine coolant at the radiator reaches at least 195 degrees F. If it doesn't or takes a long time to do it, replace the thermostat. If it does reach temperature within approximately five minutes, then suspect it is one of the sensors.

Let us know what is found. If it requires the sensor to be replaced, we will then determine which one you have or if you have both.

Take care,

Joe

See pics below.
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Sunday, November 14th, 2021 AT 7:12 PM
Tiny
OL LADYL
  • MEMBER
I'm going to replace the thermostat and see if that fixes it as I've already changed the ECT sensor, twice. (Could never locate CHT sensor.) Thank you and I ll update ASAP.
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Sunday, November 14th, 2021 AT 9:45 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If does have a CHT sensor, it will either be in the rear of the cylinder head (right bank) or under the intake toward the front left.

Based on the codes, I think replacing the thermostat is a good idea. Hopefully, that will take care of your problems.

Take care and let us know.

Joe
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Monday, November 15th, 2021 AT 5:27 PM

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