Coolant Sensors all 3, 454 7.4 big block

[jamesT]

Okay, sensor: 1- Engine coolant going to computer
2- Engine coolant going to dash
3- Engine coolant going to fan?

1 is at the front of engine
2 is on driver side
3 is on passenger sid

thread pitch on 1 is 3/8
2 is 1/2
3 ?????
Even ac delco doesn't have the spec on its website, 2 dealerships, nothing. Did I miss something in the haynes manual? Also, the pigtail end on this on is not entirely oval, it has edges on either side.

You guys are the best hope everyone is doing great.

 

[454cid]

Heads should be identical.

 

[jamesT]

Thanks 454cid. I think I found the right one from standard on rockauto. Thing is, the thread size is never listed by the better parts companies, but I'm not ordering 5 different parts. Also, the pigtail connector has changed.

My parts store here in canada wants 105.95 cdn -that's $84.60 US, for just the pigtail.

Thanks again.

 

[PlayingWithTBI]

Thing is, the thread size is never listed by the better parts companies,

If it's too small, like a 3/8" NPT, you can always go to a hardware store and get a 1/2" X 3/8" bushing reducer to make it fit

 

[jamesT]

Thanks D O G, desert old guy, I know, your handle is playing with tbi... anyway, Great tip. New to this whole truck thing. Bought this, 4 years ago, mostly parked it during world blowing up. Used this winter, time to freshen up.

 

[PlayingWithTBI]

Thanks D O G, desert old guy, I know, your handle is playing with tbi

All good - DOG, PWTBI, even Pete, Peter, & Re-Pete. I answer to just about anything - mostly stuff that's on the new "Censor" list

 

[Supercharged111]

So passenger head sensor? That's a thing? Driver's head is to the gauge and the one on the front of the engine is for the computer.

 

[Dropped88]

So passenger head sensor? That's a thing? Driver's head is to the gauge and the one on the front of the engine is for the computer.

The pass side sensor turns the aux fan on in front

 

[Supercharged111]

The pass side sensor turns the aux fan on in front

Of course I'm nowhere near the dually. Pretty sure the PCM controls my aux fan.

 

[PlayingWithTBI]

Pretty sure the PCM controls my aux fan.

Maybe newer PCMs do. The earlier ones like the 1227747 didn't. FWIU aftermarket aux fans use a separate CTS.