Help ID these sensors. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sport/Truck · 03-12-2008, 06:56 AM

I have these sensors I pulled out of the heads below the exhaust manifolds.
They look to be tempture sensors, but the guy at NAPA couldn’t find a direct replacement. Any one know what they do? Temp gauge & warning light? (I’m not sure what my truck has) I do know it’s not a full gauge package like some do.
Thanks,
s/t

red71cheyenne · 03-12-2008, 07:11 AM

The one with the terminal sticking out is for the idiot light dash guage. The other one looks like a plug in type for electric fan on and off. You should be able to plug the passenger side one and just install a regular probe for which ever one you need, idiot light or guage. The guage probe has a little nipple on the top to slide the terminal lug over. Any parts store should have both probes. Just tell them which year you want it for.

Sport/Truck · 03-12-2008, 07:47 AM

Quote:

Originally Posted by red71cheyenne

The one with the terminal sticking out is for the idiot light dash guage. The other one looks like a plug in type for electric fan on and off. You should be able to plug the passenger side one and just install a regular probe for which ever one you need, idiot light or guage. The guage probe has a little nipple on the top to slide the terminal lug over. Any parts store should have both probes. Just tell them which year you want it for.

This truck is original...not sure why it would be in there. The guy at NAPA thought one was the Idiot light & the other for a gauge...We couldnt find a "specific" one for my truck and he showed all temp ranges too..
s/t

red71cheyenne · 03-12-2008, 07:58 AM

I would say your heads came off of something not stock. Newer year, whatever. Maybe one was used as a plug? I know NAPA has trouble with the temp senders. Don't know why. Last one I got for the Blazer I got at Autozone, he had either one on the shelf.

Blazer1970 · 03-12-2008, 03:34 PM

The extra temp sensor could be for the TCS (transmission controlled spark) system.

Sport/Truck · 03-12-2008, 03:59 PM

Quote:

Originally Posted by Blazer1970

The extra temp sensor could be for the TCS (transmission controlled spark) system.

Thats a good point, these heads are matching numbers to the truck.

Can anyone say for for sure what these are? If the one isn't being used, would that make a good spot for a gauge sending unit? (or is there a better spot?).
s/t

red71cheyenne · 03-12-2008, 05:16 PM

The stock location for the guage sending unit is on the driver's side head.

Sport/Truck · 03-13-2008, 06:48 AM

Ttt

03-12-2008, 06:56 AM	#1
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Help ID these sensors. I have these sensors I pulled out of the heads below the exhaust manifolds. They look to be tempture sensors, but the guy at NAPA couldn’t find a direct replacement. Any one know what they do? Temp gauge & warning light? (I’m not sure what my truck has) I do know it’s not a full gauge package like some do. Thanks, s/t Attached Images __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

03-12-2008, 07:11 AM	#2
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Help ID these sensors. The one with the terminal sticking out is for the idiot light dash guage. The other one looks like a plug in type for electric fan on and off. You should be able to plug the passenger side one and just install a regular probe for which ever one you need, idiot light or guage. The guage probe has a little nipple on the top to slide the terminal lug over. Any parts store should have both probes. Just tell them which year you want it for. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

03-12-2008, 07:58 AM	#4
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Help ID these sensors. I would say your heads came off of something not stock. Newer year, whatever. Maybe one was used as a plug? I know NAPA has trouble with the temp senders. Don't know why. Last one I got for the Blazer I got at Autozone, he had either one on the shelf. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty Last edited by red71cheyenne; 03-12-2008 at 07:59 AM.

03-12-2008, 03:34 PM	#5
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Help ID these sensors. The extra temp sensor could be for the TCS (transmission controlled spark) system. __________________ Tim

03-12-2008, 05:16 PM	#7
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Help ID these sensors. The stock location for the guage sending unit is on the driver's side head. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

03-13-2008, 06:48 AM	#8
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Help ID these sensors. Ttt __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.



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