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Coolant Temp Sensor Location?

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Old 12-06-2007, 01:09 PM   #1
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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?
Old 12-06-2007, 04:11 PM   #2
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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.
Old 12-06-2007, 05:29 PM   #3
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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.
Old 12-10-2007, 04:37 PM   #4
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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
Old 04-01-2008, 10:27 PM   #5
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Re: Coolant Temp Sensor Location?

Quote: Originally Posted by rat
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?
Old 04-01-2008, 10:36 PM   #6
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Re: Coolant Temp Sensor Location?

Quote: Originally Posted by Tennted
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.
Old 04-01-2008, 11:39 PM   #7
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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.
Old 04-02-2008, 10:44 AM   #8
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Re: Coolant Temp Sensor Location?

Quote: Originally Posted by rat
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.
Old 04-03-2008, 07:06 AM   #9
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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...

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

http://www.autozone.com/servlet/UiBr...3d8018b920.jsp
Old 11-02-2008, 11:07 PM   #11
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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.
Old 11-03-2008, 07:26 AM   #12
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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.
Old 11-03-2008, 08:38 AM   #13
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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.
Old 11-03-2008, 09:39 PM   #14
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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.
Old 12-28-2009, 06:16 PM   #15
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Re: Coolant Temp Sensor Location?

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

Quote: Originally Posted by SicOne
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.
Old 10-03-2011, 10:38 PM   #17
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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
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.
Old 11-30-2011, 05:06 PM   #18
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Re: Coolant Temp Sensor Location?

Quote: Originally Posted by ab7oh
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
Old 12-21-2011, 07:47 PM   #19
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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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Old 07-02-2012, 05:05 PM   #20
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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
Old 07-14-2013, 05:11 PM   #21
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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
Old 07-14-2013, 07:54 PM   #22
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Re: Coolant Temp Sensor Location?

roughly 200-210 degrees.
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