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post #1 of 33 Old 12-06-2007, 01:09 PM Thread Starter
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Question Coolant Temp Sensor Location?

Where is the coolant temperature sensor located on a '96 4.3L? I checked AutoZone's diagram, and I'm not exactly sure what I'm looking at there... http://www.autozone.com/images/cds/g...3d8018b926.gif

Also, when I attempt to change the sensor, will coolant leak out? Any tips?

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post #2 of 33 Old 12-06-2007, 04:11 PM
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Re: Coolant Temp Sensor Location?

Front of the intake manifold, under the t-stat housing is what the pic is of.

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post #3 of 33 Old 12-06-2007, 05:29 PM
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Re: Coolant Temp Sensor Location?

I did it on my '96 a few years ago. It is directly under the t-stat housing, correct.

Some coolant may leak out, but, just have the new sensor handy. Preferably don't change it while the coolant is hot You'll lose minimal coolant.
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post #4 of 33 Old 12-10-2007, 04:37 PM
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Re: Coolant Temp Sensor Location?

I took that out once while the truck was hot, I thought it was my EGR valve. O man, what I have learned since I owned this truck. lol
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post #5 of 33 Old 04-01-2008, 10:27 PM
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Re: Coolant Temp Sensor Location?

Quote:
Originally Posted by rat View Post
Front of the intake manifold, under the t-stat housing is what the pic is of.
I have a 2001 S10 Blazer with an engine coolant sendor code. Where is the sensor on this vortec 4.3? I have looked everywhere. I found the gage sender on the left head. is there one sensor for both the gage and the computer?
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post #6 of 33 Old 04-01-2008, 10:36 PM
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Re: Coolant Temp Sensor Location?

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Originally Posted by Tennted View Post
I have a 2001 S10 Blazer with an engine coolant sendor code. Where is the sensor on this vortec 4.3? I have looked everywhere. I found the gage sender on the left head. is there one sensor for both the gage and the computer?
There is only one on '98+ trucks, on the drivers side head.

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post #7 of 33 Old 04-01-2008, 11:39 PM
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Re: Coolant Temp Sensor Location?

ya right above the middle spark plug wire.dont belive the others coolant comes out, lots of it. keep a pan under your truck.

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post #8 of 33 Old 04-02-2008, 10:44 AM
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Re: Coolant Temp Sensor Location?

Quote:
Originally Posted by rat View Post
There is only one on '98+ trucks, on the drivers side head.
I have a '98 (W code) and it has 2. One at the front of the intake manifold right next to the t-stat, and the second on the driver's side head.
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post #9 of 33 Old 04-03-2008, 07:06 AM
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Re: Coolant Temp Sensor Location?

On my 92 4.3 TBI, there are two coolant "sensors". One is a Coolant Temperature Sensor and the other is a Coolant Temperature Switch... The Sensor is for the Engine computers to calculate the air/fuel ratio and the Switch gives you the temp reading on the dash.

If I remember correctly, the Sensor was at the top of the engine in front of the air cleaner and the switch was down on the passenger side of the block around the spark plug area...

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post #10 of 33 Old 04-08-2008, 01:39 PM
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Re: Coolant Temp Sensor Location?

http://www.autozone.com/servlet/UiBr...3d8018b920.jsp
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post #11 of 33 Old 11-02-2008, 11:07 PM
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Re: Coolant Temp Sensor Location?

Not to bring up an old post but I did not want to start a new thread for a similer question. I have a 97 v6 and I unpluged the one under the tstat and tested it. tested fine so I thought my gage was off but i noticed that the gage still worked. Now I did notice a single wire that was behind the intake and ran to a sensor between the 3rd and 5th spark plug. I was going to post to see if anyone knew what this was for but now im thinking it is for the temperature gage. My question is is that what it is and if so how do I test it. I have an ohm meter but it needs two wires to hook up? Can i ground one to the frame? If not just what is it? If you need pics let me know.
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post #12 of 33 Old 11-03-2008, 07:26 AM
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Re: Coolant Temp Sensor Location?

The way I understand it, the one under the t-stat is used by the computer and the one in the head is used for the temp-gauge. I could be wrong, but that is what was explained to me.
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post #13 of 33 Old 11-03-2008, 08:38 AM
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Re: Coolant Temp Sensor Location?

Some of the 4.3s have the knock sensors in the heads too. To check, try disconnecting the wire that you think is the temp. sensor with the ignition on. The gauge should go down. Then short the wire to ground and the gauge should peg at the top of the scale.

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post #14 of 33 Old 11-03-2008, 09:39 PM
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Re: Coolant Temp Sensor Location?

I will have to test this tommorrow. The question really isn't if it works but how accurate. When I check the one for the computer it is right around 250 ohms which is close to 190. But the gage only shows about 140 or so. There is only one wire so there is nothing to ground to to check the ohms. I guess it is not that important but I just like thinks to work the way they are made to.
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post #15 of 33 Old 12-28-2009, 06:16 PM
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Re: Coolant Temp Sensor Location?

bringing it back.... Which one works the gauge? I have 1 on either head.
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post #16 of 33 Old 12-29-2009, 10:11 AM
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Re: Coolant Temp Sensor Location?

Quote:
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bringing it back.... Which one works the gauge? I have 1 on either head.
On my 93 vin W mine is on the passenger side head. The sensor in the drivers side head is the knock sensor on mine.

The temp sensor for the computer is on the intake manifold.

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post #17 of 33 Old 10-03-2011, 10:38 PM
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Re: Coolant Temp Sensor Location?

Hello

Is the sending unit for the gauge the same as for the computer? I have a 93 S10 Blazer 4X4 VIN W

Thank You
Richard



Quote:
Originally Posted by 93_Deuce View Post
On my 93 vin W mine is on the passenger side head. The sensor in the drivers side head is the knock sensor on mine.

The temp sensor for the computer is on the intake manifold.
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post #18 of 33 Old 11-30-2011, 05:06 PM
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Re: Coolant Temp Sensor Location?

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Originally Posted by ab7oh View Post
Hello

Is the sending unit for the gauge the same as for the computer? I have a 93 S10 Blazer 4X4 VIN W

Thank You
Richard
well shoot that was my question too - tho mines a 94 W truck
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post #19 of 33 Old 12-21-2011, 07:47 PM
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Re: Coolant Temp Sensor Location?

I'm a noob, just brought this home. No temp gauge? on a 94 is on the head?? For the gauge?
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post #20 of 33 Old 07-02-2012, 05:05 PM
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Re: Coolant Temp Sensor Location?

I have SES code P1404 and the code reader book says the EGR Temperature Sensor is faulty ?
I can not find such a part listed on parts pages.
I have been changing the EGR daily after soaking each one over night in cleaners.
I get the SES light on in 10 miles of driving. When I take the EGR off the engine the plunger is NOT stuck open. It is seated in the closed position.

Help
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post #21 of 33 Old 07-14-2013, 05:11 PM
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Re: Coolant Temp Sensor Location?

As an aside topic to this question = what is the correct coolant TEMPERATURE range for a '90 4.3L Pickup? It is not in the Buyer's Manual and I cannot get an answer on-line (I keep getting referred to cooling system parts) but NO temperature numbers. I have just replaced the Water Pump and thought it should be running around 190 (the thermostat's calibration) not 30 to 60 degrees above that.
Anyone know the correct operating temperature for the 1990 4.3L?? Murf
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post #22 of 33 Old 07-14-2013, 07:54 PM
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Re: Coolant Temp Sensor Location?

roughly 200-210 degrees.

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post #23 of 33 Old 05-25-2015, 04:08 PM
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Re: Coolant Temp Sensor Location?

93 GMC 4.3L V6. Found 2 things that might be temp senders. The first is on top at the front. The second is on drivers side between middle and rear plugs.

Are they both temp senders? Which is the one that goes to the dash gauge? Or did I get this completely wrong?
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post #24 of 33 Old 06-29-2015, 11:34 PM
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Re: Coolant Temp Sensor Location?

According to Autozone:
TEMPERATURE SWITCH
1993 GMC Truck S15 2WD 4.3L CPI 6cyl
The Temperature Switch is located:
Under hood, driver side, upper engine area, below valve cover, next to the rear exhaust port, mounted in the cylinder head

COOLANT TEMPERATURE SENSOR
1993 GMC Truck S15 2WD 4.3L CPI 6cyl
The Coolant Temperature Sensor is located:
Under hood, center, upper engine area, front side of engine block, mounted in water outlet

It would seem logical that the Temperature SENSOR would go to the gauge, and the temperature SWITCH would go to the computer, right?

Right? Anybody? Huh? Right?
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post #25 of 33 Old 06-29-2015, 11:38 PM
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Re: Coolant Temp Sensor Location?

The second picture with the two wire connector is the sensor for the computer. I can't remember what the sender/switch looks like year to year, but it'll be a one wire connector and it'll operate the gauge. Later years used the sensor for the gauge and computer, but I don't know when that switch was made. Is it that your gauge is not working that's prompting this question?
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post #26 of 33 Old 06-29-2015, 11:45 PM
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Re: Coolant Temp Sensor Location?

Quote:
Originally Posted by NTL1991 View Post
On my 92 4.3 TBI, there are two coolant "sensors". One is a Coolant Temperature Sensor and the other is a Coolant Temperature Switch... The Sensor is for the Engine computers to calculate the air/fuel ratio and the Switch gives you the temp reading on the dash.

If I remember correctly, the Sensor was at the top of the engine in front of the air cleaner and the switch was down on the passenger side of the block around the spark plug area...

Nick
That seems backward to me. Wouldn't the sensor go to the gauge? Seems like a switch would just be in one of 2 positions, open or closed. How would a gauge get enough information from a switch to show accurate changes in temperatures? No, wait, maybe the switch is more like a digital switch, sending the gauge a stream of ones and zeros. Hmm. I dunno.
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post #27 of 33 Old 06-29-2015, 11:47 PM
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Re: Coolant Temp Sensor Location?

It's because it's not a switch, is a sender labeled as a switch and parts stores don't know shit and never listen to anything they tell you ever.
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post #28 of 33 Old 06-29-2015, 11:48 PM
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Re: Coolant Temp Sensor Location?

Quote:
Originally Posted by SmokinDan View Post
The second picture with the two wire connector is the sensor for the computer. I can't remember what the sender/switch looks like year to year, but it'll be a one wire connector and it'll operate the gauge. Later years used the sensor for the gauge and computer, but I don't know when that switch was made. Is it that your gauge is not working that's prompting this question?
Yes, it just stays at full cold at all times. I will do the sensor test. (Grounding the singe white wire) and report back. Thanks for the reply!
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post #29 of 33 Old 06-29-2015, 11:50 PM
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Re: Coolant Temp Sensor Location?

Thanks, SmokinDan, Unfortunately I will have to wait until tomorrow to do the test. G'nite!
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post #30 of 33 Old 06-29-2015, 11:54 PM
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Re: Coolant Temp Sensor Location?

Yeah, key on engine off, ground the sender wire and it should sweep the gauge.
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post #31 of 33 Old 07-01-2015, 01:26 AM
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Re: Coolant Temp Sensor Location?

I melted my CTS off twice.

Passenger side head, between the front 2 cylinders.

I also have a 1993 but the engine is from a 94 it is VIN W and it was a one wire sensor. Had to look to find one that was not 2.

I also show it in the video I did about my spark plugs. Again.. I did all but 1 (!) cylinder, from the top and without removing or loosening anything. And I probably could have got that last one the same way, but, I decided to go in through wheel well, and the result could not have been better. But I only did it for that one.. driver side rear plug.
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post #32 of 33 Old 07-03-2015, 02:46 PM
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Re: Coolant Temp Sensor Location?

OK, I did the test. The gauge did not move at all. Look's like I need to get an after market gauge. Electrical or Mechanical? Which is easier? Can I use any generic gauge/sender combo? I already have a mechanical/analog temp gauge that was for a different project. Either way, I have to drill a hole through the firewall, right?
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post #33 of 33 Old 07-03-2015, 03:38 PM
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Re: Coolant Temp Sensor Location?

Personally I'd see about fixing the gauge. I hate aftermarket shit. I don't have a preference between mechanical or electrical.
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