C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Temperature Sending Unit

Thread Tools
 
Search this Thread
 
Old Jul 26, 2011 | 06:21 PM
  #1  
codimcleod's Avatar
codimcleod
Thread Starter
Heel & Toe
 
Joined: Jul 2011
Posts: 17
Likes: 0
From: ontario
Default Temperature Sending Unit

My water temp gauage is not connected from what I can see and not working in the dash...1969/350 small block ..wondering if the sending unit screws in on the bottom side of the motor right where the headers are covering....or hopefully on top there is a plug location where the top rad hose runs...looked at the manual very vague as to location...any help..Codi
Reply
Old Jul 26, 2011 | 07:25 PM
  #2  
imariver's Avatar
imariver
Drifting
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2008
Posts: 1,873
Likes: 27
From: Sonora CA
Default

The water temperature sending unit is located between the #1 & #3 sparkplugs...... they're located below the valve cover...........
Reply
Old Jul 26, 2011 | 09:12 PM
  #3  
codimcleod's Avatar
codimcleod
Thread Starter
Heel & Toe
 
Joined: Jul 2011
Posts: 17
Likes: 0
From: ontario
Default

thanks I guess... just kidding not to shoot the messenger LOL...that means the retard I bought the car from did not notch the headers for the sending unit......great that should be fun with the hookers and all...Codi
Reply
Old Jul 26, 2011 | 11:31 PM
  #4  
TimAT's Avatar
TimAT
Le Mans Master
15 Year Member
Liked
Loved
 
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Default

Feel around the flange- just about all SBC headers are notched for the sender- that's the standard location. Won't hurt anything to put it in the intake next to the t'stat either.
Reply
Old Jul 26, 2011 | 11:33 PM
  #5  
Willcox Corvette's Avatar
0Willcox Corvette
Former Vendor
 
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Default

Look for the green wire too.. Once you find the wire remove it from the sender and if the dash unit is working it should go to cool. Then ground the green wire to the block and the dash unit should peg. If it does this then the dash unit is working fine and replace the sender.

If the gauge fails to move then you'll need to get behind it and do some testing.

Willcox
Reply
Old Jul 27, 2011 | 07:54 AM
  #6  
codimcleod's Avatar
codimcleod
Thread Starter
Heel & Toe
 
Joined: Jul 2011
Posts: 17
Likes: 0
From: ontario
Default

Thanks for all the help guy's will be trying everything today hopefully..Codi
Reply
Old Jul 27, 2011 | 11:02 AM
  #7  
68sbcoupe's Avatar
68sbcoupe
Instructor
 
Joined: Jun 2011
Posts: 183
Likes: 1
From: Litchfield CT
Default temp sender

Originally Posted by codimcleod
thanks I guess... just kidding not to shoot the messenger LOL...that means the retard I bought the car from did not notch the headers for the sending unit......great that should be fun with the hookers and all...Codi
The temp sender can also be on the intake manifold. As Wilcox said, look for the green wire across your driver side valve cover or intake manifold. If there is none present, then you can always mount the temp sender in a tube, and splice it in the upper radiator hose. Lots of racers do this.

The PO was likely not the guilty party. Header manufacturer was.
Reply
Old Jul 27, 2011 | 11:43 AM
  #8  
qtlow's Avatar
qtlow
Pro
15 Year Member
Active Streak: 120 Days
 
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
Default

If the temperature sender is where it's supposed to be it will be right here on the drivers side and look like this.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-1

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-2

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-3

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-4

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-5

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-6

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-7

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-8

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-9

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
Old Jul 27, 2011 | 11:55 AM
  #9  
azguy's Avatar
azguy
Instructor
 
Joined: Nov 2007
Posts: 185
Likes: 0
Default

sounds alot like the previous owner of mine. He bought the wrond sending unit so that the connectiopns didnt match up and instead of exchanging it for the right one he left it in the block unconnnected. same with the oil pressure unit. Hard to believe what goes through some people heads sometimes.
Reply
Old Jul 27, 2011 | 06:11 PM
  #10  
codimcleod's Avatar
codimcleod
Thread Starter
Heel & Toe
 
Joined: Jul 2011
Posts: 17
Likes: 0
From: ontario
Default

Great help everyone...especially the pic.......I opened up the dash cause I could not find the green wire from the harness inside the engine compartment...the green wire leaves the dash gauge and then goes to uganda.....Could not find it so I will run a new wire from the sending unit to the dash gauge GRRR...would it be a big deal to put the sending unit up on top the motor beside the thermostat housing? Thanks Codi
Reply
Old Jul 27, 2011 | 06:18 PM
  #11  
Willcox Corvette's Avatar
0Willcox Corvette
Former Vendor
 
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Default

Originally Posted by codimcleod
Great help everyone...especially the pic.......I opened up the dash cause I could not find the green wire from the harness inside the engine compartment...the green wire leaves the dash gauge and then goes to uganda.....Could not find it so I will run a new wire from the sending unit to the dash gauge GRRR...would it be a big deal to put the sending unit up on top the motor beside the thermostat housing? Thanks Codi
You don't need to do that... go to the firewall bulk head connector... You should be able to split the tape there and find the green wire. It is on the inner side connector (there are two halves), on the starter harness.

If you find the wire here.. then see if you can find where it runs to. If it is cut then you can extend it out and then test as I said above. No sense in tearing the dash apart just yet...
Reply
Old Jul 27, 2011 | 06:24 PM
  #12  
Willcox Corvette's Avatar
0Willcox Corvette
Former Vendor
 
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Default

Here is a schematic.. you'll see where the wire runs.


Last edited by Willcox Corvette; Jul 27, 2011 at 06:27 PM.
Reply

Get notified of new replies

To Temperature Sending Unit





All times are GMT -4. The time now is 07:32 AM.

story-0
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-1
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-2
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-3
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-4
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-5
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-6
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-7
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-8
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-9
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE