Temperature gauge reads center, then works towards hot, about three-fourths the way, then comes back down to center?

Tiny
JDSTARNER
  • MEMBER
  • 2016 FORD F-150
  • 3.5L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
So, a new water pump installed in October of 2022, this past week a new thermostat and coolant temperature sensor installed as well as a new throttle body.
Now what's going on is, when driving to work in the morning, the temperature gauge reads in the center, then in the afternoon it goes to center, then works towards hot, about 3/4's the way, then comes back down to center. Goes back and forth. When I come to a stop, it will sit the center and seems normal. After stopping at the store for 15 minutes, upon starting the truck up, the temperature gauge went to hot, after 30 seconds it came back to normal.
Could this be an issue with the new sensor? The built in resistor is not working at 100%? Or something else?
Tuesday, June 27th, 2023 AT 6:04 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
When they replaced the engine coolant sensor, did they use an OEM unit? Or it could have been over tightened which can damage the sensor or there is a bad connection at the sensor. But I would check the coolant level. Here is the location of the sensor so you can check it out. Check out the images (below). Please let us know how it goes.
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Tuesday, June 27th, 2023 AT 10:21 AM
Tiny
JDSTARNER
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Yes, OEM done at the dealership. Coolant is at max level in overflow tank. I'm changing all 3 relays now and will see if that has any improvement.
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Tuesday, June 27th, 2023 AT 12:16 PM
Tiny
KEN L
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Okay, the sensor could have been over tightened, or it is defective, did you tell the Ford dealer that did the work the problem? Let me know how it goes with the relays.
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Wednesday, June 28th, 2023 AT 10:36 AM

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