Coolant temperature sensor location

Tiny
WASHGUY
  • MEMBER
  • 2001 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • 157,000 MILES
Computer said my coolant temperature sensor was bad. I purchased one. Have looked at many diagrams for location. I removed alternator and took out sensor behind thermostat housing and below about a foot towards center of motor. Have done small jobs before but cannot find this one. Thanks for help! The sensor I took out is much smaller in diameter at the threads than my new one.
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Sunday, November 10th, 2019 AT 8:49 AM

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Tiny
KASEKENNY1
  • EXPERT
Just make sure you got the correct sensor and am looking in the correct location. I have run into this many times with people not getting the correct sensor. This engine has a Cylinder Head Temperature sensor and a lot of stores will not look this up correctly.
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Sunday, November 10th, 2019 AT 5:18 PM
Tiny
CARADIODOC
  • EXPERT
There's a whole bunch of problems here. The first one is there is no drawing that shows the location of the coolant temperature sensors. There is a cylinder head temperature sensor indicated at the bottom / center of the first drawing. They do make reference to two other coolant temperature sensors, but they aren't even shown on the electrical diagrams. At this point I can't show you were they are, but you will usually find them close to the thermostat housing at the end of the upper radiator hose. On V-type engines, you might also find them on the intake manifold. With inline engines, they might be found on the side of the block.

The next problem is there are usually two of them. One is for the dash gauge and will have just one wire connected to it. The other is for the Engine Computer and will always have two wires. Ford did have a lot of trouble with the two-wire sensors in the early to mid '90s, but other than that, temperature sensors have an extremely low failure rate because there's just one component inside them. It's much more common to find spread or corroded connector terminals that aren't making a solid connection.

The last concern is the diagnostic fault code did not say to replace the sensor or that it was bad. Fault codes never say that on any brand or model. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. First we have to rule out wiring and connector terminal problems associated with that part. Also, there are many fault codes that can be set related to temperature sensors, and they mean very different things. What was the exact fault code number you're diagnosing?
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Sunday, November 10th, 2019 AT 5:35 PM
Tiny
CARADIODOC
  • EXPERT
Hi KASEKENNY1. Looks like we found the same diagrams.
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Sunday, November 10th, 2019 AT 5:37 PM

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