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Discussion Starter · #1 ·
So my ect sensor went bad years ago, I tried to replace it but I got the wrong one that was designed for the ecu, not the dash, so I finally got the right one, and immediately upon starting the truck, even just turning the key on, it shows like it's too hot

Any ideas?

Last week since my ext sensor wasn't working, I overheated the engine a bit and the radiator cracked, so I replaced it along with a new ect sensor, but now it's showing too hot, not sure what's going on.
 

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Soooo, where did this new sensor come from? Is it Aftermarket or from Ford?

I'd say it looks to just be bad (more so if Chinese) how about what happens if you Unplug it? Does the gauge remain "pegged"?
 

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Discussion Starter · #3 ·
I gave Napa a Ford part number and they gave me that part, I wish I hadn't thrown the box out, it would make it easier to identify.
I will try unplugging it and see what happens
 

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I bet it was not a true Motorcraft or International part.

Try again, RiffRaff, Diesel O Rings, BitterRoot, maybe a few others on the electron highway, or just go to your favorite local Ford or International counter guy/ or gall.
 

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Disconnecting the sensor wire will tell if the gauge can work, as was mentioned earlier
 

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Discussion Starter · #6 ·
I unplugged the sensor and it didn't work at all, I replaced it with a new sensor, and the same thing happened, it shot up immediately upon turning the key on,

Here is the part number from Napa.

Font Gas Auto part Electric blue Thumb


Why are these stores selling parts that don't work? Everyone seems to have this issue with these sensors


Its ridiculous
 

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So, ...does the gauge move when you disconnect the wire from the sender ?

Measure the Ohms on the sensor at room temperature, what do you get ?

What year is this truck?
and where exactly on the engine is the sensor you are replacing?
 

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Yes, Year, always important ;) If it's an '01, does it have a Trans Temp gauge and Digital OD in the cluster?

But, you Unplug it, and the gauge goes to Zero? ~ right? What happens if you short the two connector pins together? Does it go back to maxed-out? (might indicate a shorted sensor, but not likely on Two of them!) Ohm readings are a good idea, you might even try to see a change from immersing it in Cold then Hot water.

"Years Ago", was this the same reason you tried to replace the Original one? (the problem could be in the Cluster itself...)
 

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Discussion Starter · #9 ·
Years ago the sensor went bad, it showed all the way cold,(aka nothing no movement at all ever) then when i tried to get a replacement from advance and put it in nothing changed, when I got the part from Napa recently, after putting it in it showed all the way hot, even when just turning the key on, when I unplugged the Napa one, it went back to showing nothing.

I don't have a meter handy otherwise I would ohm the contacts
 

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Discussion Starter · #10 ·
So, ...does the gauge move when you disconnect the wire from the sender ?

Measure the Ohms on the sensor at room temperature, what do you get ?

What year is this truck?
and where exactly on the engine is the sensor you are replacing?
It's a 98 e450, an old ambulance that I converted to a work truck.


The sensor is right on top of what I presume to be the water pump, right near the thermostat. Just under the hpop
 

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They could be giving you a transmission sensor instead of engine coolant -- they look the same but read differently
I didn't find any useful information on the part number you have in the pic

Coolant Temperature sender at room temp approx.... 44k ohms
Transmission Temperature sender at room approx... 2-4k ohms
 

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Discussion Starter · #12 ·
They could be giving you a transmission sensor instead of engine coolant -- they look the same but read differently
I didn't find any useful information on the part number you have in the pic

Coolant Temperature sender at room temp approx.... 44k ohms
Transmission Temperature sender at room approx... 2-4k ohms
I gave them the Ford part # SW-5174

It came up as showing coolant temp sensor for dash gauge.

Is that the wrong part #?

Anywhere I can just order the right part?

Maybe the dealership, lol I forget that they're an option
 

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These are the numbers I come up with for the 99 E450
I think the black connector is for the idiot light

Temp Sending Unit - Ford (F65Z-10884-AA) - 1997-2007
Coolant Temp Sensor - Ford (3F1Z-12A648-A) - Gray connector - 1991-2021
 
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