Water temperature sensor

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Jun 21, 2008 | 04:25 PM

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Thread Starter

Racer

Joined: Apr 2007

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From: Milan

Water temperature sensor

Where exacltly is located on a 69' 350 ? Between spark plugs 1-3 ?
Any detailed picture? Thanks!

Jun 21, 2008 | 05:41 PM

Dirtbuster1

Racer

Joined: May 2007

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From: Ga.

That's were it is on my 82. Mine is a green wire.

Jun 21, 2008 | 05:58 PM

69 Convertible

Burning Brakes

Joined: Feb 2007

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From: San Bruno California

Here's a pic. of my 69 sb. Can you tell me if you can where on your stock gauge does your neddle sit when it's warmed up? Can't get anyone to answer that question. Thanks Tony

Jun 21, 2008 | 09:04 PM

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Thread Starter

Racer

Joined: Apr 2007

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From: Milan

Ok perfect, a green wire, thanks for the pic Tony

It's a strange situation, my water temp gauge works regualr (190° warmed with 195° t-stat) until last week.
Now I replaced the water pump, t-stat (160°), hoses, coolant and the gauge doesn't work properly (it remains at min. or quickly oscillates from min to max)

So I was checking for the water temp sensor but it's disconnected and I don't find the green wire!

Jun 21, 2008 | 09:12 PM

69 Convertible

Burning Brakes

Joined: Feb 2007

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From: San Bruno California

so there's no temp sending unit on now? If that's the case, how were you able to get a reading on your gauge? At 190, where would your neddle be pointing at? It's 100 then the hash then 210, then another hash then 250. Where is 190? Tony

Jun 22, 2008 | 11:43 PM

pws69

Melting Slicks

Joined: Nov 2001

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From: Eastern US XX

Quote:

Originally Posted by 69 Convertible

Here's a pic. of my 69 sb. Can you tell me if you can where on your stock gauge does your neddle sit when it's warmed up? Can't get anyone to answer that question. Thanks Tony

The correct sender for a '69 has a straight pin for the gauge wire connection.

Jul 5, 2008 | 09:57 AM

Eddie 70

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From: Lenoir City Tennessee

Ci 6, 8 & 10 Veteran

St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15

Does anyone know the thread size on the temp sensor?

I want to use this sensor on my LS conversion so I can keep the gauges as close to stock as possible.

Thanks for any help guys.

Jul 5, 2008 | 10:01 AM

pws69

Melting Slicks

Joined: Nov 2001

Posts: 2,668

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From: Eastern US XX

Quote:

Originally Posted by Eddie 70

Does anyone know the thread size on the temp sensor?

I want to use this sensor on my LS conversion so I can keep the gauges as close to stock as possible.

Thanks for any help guys.

On the stock head, it is 1/2" NPT, however, on newer heads, it could be 3/8" NPT. If it is a 3/8" NPT hole, and you want to find a sender that will work with the stock gauge, then the sender should measure as close to these values as possible:

220 degrees = 70 ohms
200 degrees = 90 ohms
180 degrees = 115 ohms
160 degrees = 140 ohms
120 degrees = 250 ohms
100 degrees = 340 ohms

Last edited by pws69; Jul 5, 2008 at 10:05 AM.

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Jul 5, 2008 | 10:27 AM

Eddie 70

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From: Lenoir City Tennessee

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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15

I guess I could have added some more info on this and maybe we can narrow it down. The stock motor is a base small block for 1970. Reading the resistance from the point where the wire connects to the sensor to the threads should give me the resistance of the sensor. I will post this back later when I find this info. My car is at my buddies house right now, 30 miles away. It is a single wire connector on the unit if this helps.

Last edited by Eddie 70; Jul 5, 2008 at 10:41 AM.

Jul 6, 2008 | 11:06 AM

#10

Racer11

Racer

Joined: Nov 2006

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From: McLouth Kansas

Quote:

Originally Posted by pws69

The correct sender for a '69 has a straight pin for the gauge wire connection.

I replaced my temp sending unit that I got from a auto parts store and the connector did not have a pin that came out straight. And the temp did not read right on the gauge in the car.

I bought a temp sending unit from a vette supplier ( I think it was Ricks vetts ) and the sending unit had a straight pin and the unit gave the correct reading on the gauge in the car. 195 deg thermostat and the guage was showing just a tad under the 200deg.

My guess the sending unit in the pic came from a auto parts store and those dont work right.

Jul 6, 2008 | 05:39 PM

#11

Eddie 70

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From: Lenoir City Tennessee

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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15

Quote:

Originally Posted by 69 Convertible

Here's a pic. of my 69 sb. Can you tell me if you can where on your stock gauge does your neddle sit when it's warmed up? Can't get anyone to answer that question. Thanks Tony

My sensor is like the one pictured. I believe this to be a 1/2 X 14 NPT. I need an adapter to go from M12 X 1.5 to 1/2 X14 NPT. So far I am not having a whole heck of a lot of luck. Any help would be appreciated

Can someone confirm that this is a 1/2 X 14 NPT fitting for me.

Thanks

Last edited by Eddie 70; Jul 6, 2008 at 05:53 PM.

Jul 6, 2008 | 07:42 PM

#12

69 Convertible

Burning Brakes

Joined: Feb 2007

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From: San Bruno California

Here's a though, would changing back to the original rod type end give me the right reading? Does the two different end ( rod vs flat ) give different readings?

Jul 6, 2008 | 08:10 PM

#13

69 Convertible

Burning Brakes

Joined: Feb 2007

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From: San Bruno California

The stock sender is 1/2 NPT.

Jul 6, 2008 | 09:09 PM

#14

Eddie 70

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From: Lenoir City Tennessee

Ci 6, 8 & 10 Veteran

St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15

Quote:

Originally Posted by 69 Convertible

The stock sender is 1/2 NPT.

Thanks for the confirmation on this Anthony.

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