best place to pull temperature - The 1947 - Present Chevrolet & GMC Truck Message Board Network

724wdcopper · 03-23-2005, 02:56 AM

anyone got suggestions on where the best place to set the temperature sensor? the cross over on the manifold is out, the hose is too close. i have a sensor in the drivers head right now that i think took a crap, gauge stopped working. it was never accurate anyway because the engine and sensor are 1995 and the hole is smaller than the 1972 sensor. my water pump has the plug in the top that looks to be the right size, but isnt that water cooled already? should nt i want to take the hot temp? how about a spacer under the existing housing with a sensor in it? my race car friend thinks this would be best, but i am having a tough time finding the spacer with the hole in it. any suggestions?

68C15 · 03-23-2005, 07:46 AM

I know there is on the average about 15 degrees difference between the head & thermostat. most engineers like to use the head as it shows a higher temp to scare people sooner. head down to your local parts store & open the Standard Motor Products illustrated parts catalog. there will be a listing of senders with the correct thread size (3/8 NPT) for your heads. if I get a chance today I will look at work.

Tx Firefighter · 03-23-2005, 08:45 AM

This is an old problem. No one has ever found a sensor that will work to my knowlege. Everyone that fits the later model heads has the wrong electrical value.

I've had to run the original sensor in the intake manifold and put a shield on top of the sensor so the radiator hose doesn't rub a hole on the sensor's wiring connector.

400ex · 03-23-2005, 08:50 AM

I installed new VDO guages and used the temp under the water hose in the intake. But I had my brother machine out a 2inch spacer to bring the water neck up so it doesn't interfere with the temp wire.

Good luck with it.

James

724wdcopper · 03-23-2005, 01:10 PM

tx firefighter, that's the problem i had. worked at a parts house and looked through the books, came up empty. and i did the shield under the hose trick, but it looked less than trick

400ex, i have seen such spacers for sale from like jegs or summit, but cant locate them now. as i stated, my race car bud says he thinks he has one with a hole for a temp sender, but he's in NC and i am in WA. a few miles difference

anyone have opinions on taking the temp from the water pump? i will continue search for the spacer with the hole.

thanks guys.

Jason915 · 03-23-2005, 01:31 PM

when I read the thread title the only thing I could think of was, under the toung or in the butt, lol

Mine is in the cylinder head and works fine

Tx Firefighter · 03-23-2005, 07:55 PM

Quote:

Originally Posted by Jason915

Mine is in the cylinder head and works fine

His heads have different size threaded holes for the sending unit. Later engines changed to smaller senders.

68C15 · 03-23-2005, 11:24 PM

find a 1/2 NPT tap.
the hole on the water pump is on the cold side of system (return from heater core)

69ChevyLB · 03-23-2005, 11:49 PM

Mine is in the thermostat housing. Uses the original 69 sending unit That was in the driver's side head.

Low69CST · 03-23-2005, 11:59 PM

I got Dart heads and had trouble finding a sending unit, but got a later model one that works. I always heard the head is most accurate, since thats your combustion chambers.

03-23-2005, 02:56 AM	#1
724wdcopper graphic designer Join Date: May 2004 Location: Spokane, Washington Posts: 841	best place to pull temperature anyone got suggestions on where the best place to set the temperature sensor? the cross over on the manifold is out, the hose is too close. i have a sensor in the drivers head right now that i think took a crap, gauge stopped working. it was never accurate anyway because the engine and sensor are 1995 and the hole is smaller than the 1972 sensor. my water pump has the plug in the top that looks to be the right size, but isnt that water cooled already? should nt i want to take the hot temp? how about a spacer under the existing housing with a sensor in it? my race car friend thinks this would be best, but i am having a tough time finding the spacer with the hole in it. any suggestions?

03-23-2005, 07:46 AM	#2
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	I know there is on the average about 15 degrees difference between the head & thermostat. most engineers like to use the head as it shows a higher temp to scare people sooner. head down to your local parts store & open the Standard Motor Products illustrated parts catalog. there will be a listing of senders with the correct thread size (3/8 NPT) for your heads. if I get a chance today I will look at work. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

03-23-2005, 08:45 AM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	This is an old problem. No one has ever found a sensor that will work to my knowlege. Everyone that fits the later model heads has the wrong electrical value. I've had to run the original sensor in the intake manifold and put a shield on top of the sensor so the radiator hose doesn't rub a hole on the sensor's wiring connector. __________________ I'm on the Instagram- @Gearhead_Kevin

03-23-2005, 01:31 PM	#6
Jason915 Registered User Join Date: Jan 2005 Location: Colorado Springs Posts: 693	when I read the thread title the only thing I could think of was, under the toung or in the butt, lol Mine is in the cylinder head and works fine __________________ 1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder

03-23-2005, 11:24 PM	#8
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	find a 1/2 NPT tap. the hole on the water pump is on the cold side of system (return from heater core) __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

03-23-2005, 08:50 AM	#4
400ex Registered User Join Date: Jan 2003 Location: Damon, Tx Posts: 56	I installed new VDO guages and used the temp under the water hose in the intake. But I had my brother machine out a 2inch spacer to bring the water neck up so it doesn't interfere with the temp wire. Good luck with it. James

03-23-2005, 01:10 PM	#5
724wdcopper graphic designer Join Date: May 2004 Location: Spokane, Washington Posts: 841	tx firefighter, that's the problem i had. worked at a parts house and looked through the books, came up empty. and i did the shield under the hose trick, but it looked less than trick 400ex, i have seen such spacers for sale from like jegs or summit, but cant locate them now. as i stated, my race car bud says he thinks he has one with a hole for a temp sender, but he's in NC and i am in WA. a few miles difference anyone have opinions on taking the temp from the water pump? i will continue search for the spacer with the hole. thanks guys.

03-23-2005, 11:49 PM	#9
69ChevyLB Active Member Join Date: Aug 2004 Location: Canton, OH Posts: 249	Mine is in the thermostat housing. Uses the original 69 sending unit That was in the driver's side head. __________________ 69 C10 LWB Project 47 Cushman Scooter Project It is better to have loved and lost than to live with a psycho all your life.

03-23-2005, 11:59 PM	#10
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I got Dart heads and had trouble finding a sending unit, but got a later model one that works. I always heard the head is most accurate, since thats your combustion chambers. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks



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