Temp gauge says overheating but the truck is 195°

80C20Jon · Jul 21, 2024

Hello everyone , looking for advice, My temp gauge slowly goes up all the way to hot. truck is running at 195. Tried a new temp sensor same , 2 other gauges same , different printed circuit same , wired completely separate same. Making me think I need another new temp sensor have ordered one

SquareRoot · Jul 21, 2024

How do you know it's running at 195?

80C20Jon · Jul 21, 2024

SquareRoot said:
How do you know it's running at 195?

Yes , checking with laser temp gun

SquareRoot · Jul 21, 2024

80C20Jon said:
Yes , checking with laser temp gun

Your measuring surface temp assuming it's accurate. So, you have replaced every part of the gauge circuit and still have the same result based on the laser gun reading? Is the sending unit the correct one for the application?

nvrenuf · Jul 21, 2024

I’d buy an aftermarket mechanical temp gauge to double check the factory gauge.

80C20Jon · Jul 21, 2024

SquareRoot said:
Your measuring surface temp assuming it's accurate. So, you have replaced every part of the gauge circuit and still have the same result based on the laser gun reading? Is the sending unit the correct one for the application?

I'm looking into that , there is a 3/8" and 1/2" sensor, my block is a 1/2" hole. Is there different 1/2" sensors? My laser temp gun is accurate

SquareRoot said:
Your measuring surface temp assuming it's accurate. So, you have replaced every part of the gauge circuit and still have the same result based on the laser gun reading? Is the sending unit the correct one for the application?

Getting parts at O'Reilly's only 2 options. If the 1/2" one I ordered does the same I'll get the 3/8" one and use a bushing to put it in the 1/2" hole in the block. My temp gun is accurate I tested it.

75gmck25 · Jul 22, 2024

Exactly which sensor did you buy? The sensor resistance profile changed over the years, and usually the one the parts guy pulls up for older trucks is not correct.

It took me a while to find one that worked well with my ‘75, and it’s got the correct 1/2” threads. The TS6T has the nailhead connector used on my ‘75, and it reads correctly. TS6 has same profile, but a different connector.

80C20Jon · Jul 22, 2024

75gmck25 said:
Exactly which sensor did you buy? The sensor resistance profile changed over the years, and usually the one the parts guy pulls up for older trucks is not correct.

It took me a while to find one that worked well with my ‘75, and it’s got the correct 1/2” threads. The TS6T has the nailhead connector used on my ‘75, and it reads correctly. TS6 has same profile, but a different connector.

Thank you I will look at my receipt

Temp gauge says overheating but the truck is 195°

80C20Jon

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SquareRoot

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80C20Jon

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SquareRoot

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nvrenuf

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