Coolant Sensors all 3, 454 7.4 big block

jamesT · Apr 1, 2022

Thing is, looks like the wire cooks before the sensor wears out.

jamesT · Apr 1, 2022

By the way, you guys catch the price of the pigtail alone up here? What's something like that in your parts?

Dropped88 · Apr 1, 2022

Yes vortec pcm controls those but tbi era got the extra sensor

Schurkey · Apr 1, 2022

Pigtails are often priced insanely.

God bless Treasure Yards.

454cid · Apr 1, 2022

I have not had any problems with wiring burning up on my 99.

EmeraldCityGuy · Apr 4, 2022

I have a 92 K2500 454. Are you considering replacing all three sensors and their pigtails as a matter of maintenance or are you having a problem? Sounds like one of them may have cracked from getting overheated, right? Did something happen to cause that or is it just age related heat cycling?

I’ve also thought of replacing the sensors and wondering if I should do it to ensure trouble-free operation…or might I be creating more potential problems.

Schurkey · Apr 4, 2022

TEST the sensors, if they work, they work. No reason to dick with them.

someotherguy · Apr 5, 2022

Dropped88 said:
Yes vortec pcm controls those but tbi era got the extra sensor

This subject comes up from time to time.. it's not a TBI vs. Vortec thing, it's more year-model based. My '96 Vortec 7.4 C3500 had the passenger side sensor for the aux fan. Definitely factory original, and the wiring was jacked, as well.

Pictures around here somewhere of it while I was trying to trace it down to hook it back up when I used that engine/harness/pcm/etc. for the '94 3500HD project.

Richard

Coolant Sensors all 3, 454 7.4 big block

jamesT

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jamesT

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Dropped88

Supporting Member

Schurkey

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454cid

Sooper Pooper

EmeraldCityGuy

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Schurkey

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someotherguy

I'm Awesome

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