No reading on temperature gauge

Tiny
AARON SMITH4
  • MEMBER
  • 2002 FORD RANGER
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I recently rebuilt my 3.0 v6 and it is running great now. But I’m not getting a reading on my temperature gauge. I’ve replaced both sensors and checked the connections and everything looks good, no corrosion. I’m at a loss here. Thermostat is new as well as the radiator. Any ideas?
Saturday, December 5th, 2020 AT 4:54 AM

7 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Since you've replaced both sensor then it sound like you might be having trouble with the wiring or gauge in the instrument cluster. I've attached the instrument cluster wiring diagram below. I've cut the picture in half so you can view larger. Here is a tutorial showing how to test wiring:

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

Hope this helps and thanks for using 2CarPros.
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Saturday, December 5th, 2020 AT 11:56 AM
Tiny
AARON SMITH4
  • MEMBER
  • 4 POSTS
Thank you Danny I’ll try this out!
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Saturday, December 5th, 2020 AT 2:29 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Okay, keep us updated as to what you find. Hope this helps and thanks for using 2CarPros.

Danny-
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Saturday, December 5th, 2020 AT 3:15 PM
Tiny
AARON SMITH4
  • MEMBER
  • 4 POSTS
So it turns out it has a temperature switch for the gauge on the down spout in front of the thermostat housing. There were two temperature sensors instead of the correct temperature sensor and temperature switch.
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Saturday, December 5th, 2020 AT 7:37 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

So did you replace the other temperature switch and that solved the problem or is the gauge still not working? Let us know and keep us updated. Thanks again for using 2CarPros.

Danny-
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Saturday, December 5th, 2020 AT 8:39 PM
Tiny
AARON SMITH4
  • MEMBER
  • 4 POSTS
The temperature sensor is on the back side of the thermostat housing with 2 wires, the temperature switch is in the front of the thermostat housing with only 1 red wire. My problem was a temperature sensors was in both spots in stead of a temperature switch in the correct spot so when I put the correct part in it worked.
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Saturday, December 5th, 2020 AT 9:19 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Glad to hear you were able to resolve the issue. Thanks again for using 2CarPros and we hope you will use our site again in the future.

Danny-
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Saturday, December 5th, 2020 AT 11:17 PM

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