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Coolant temperature sensor location?

Tiny
COOLOLDS85
  • MEMBER
  • 2010 CHEVROLET AVEO
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 73,800 MILES
Is the sensor on the thermostat housing or would the other two I circle one of them? Please let me know. I would appreciate it.
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Friday, August 21st, 2020 AT 8:26 AM

26 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

The coolant temperature sensor is mounted in the cylinder head. Here is a tutorial on how to replace a coolant temperature sensor:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

I've attached a picture below.Hope this helps and thanks for using 2CarPros.
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Friday, August 21st, 2020 AT 8:45 AM
Tiny
ASEMASTER6371
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  • 52,797 POSTS
Good morning,

I attached the picture and location of the sensor for you.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

What is the issue that leads you to replace it?

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Roy
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Friday, August 21st, 2020 AT 8:46 AM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
Thanks Roy and Danny for the reply’s. Question for Danny? When you say it’s in the cylinder head, is it in the front near the sensor that’s inside the thermostat housing? I ask because there is two sensors inside the cylinder head. One on top and one on the bottom. I thought that was the coolant temperature sensor in the thermostat housing. Let me know if it’s the sensor next to the one in the thermostat housing.

To show you exactly here is the pics.
Both in cylinder head and one in thermostat housing.
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Friday, August 21st, 2020 AT 1:10 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is a 2 wire sensor. I attached another picture with the wire colors for you to match and the location description.

Roy
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Friday, August 21st, 2020 AT 2:16 PM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
I was looking on Rockauto and see this. Do I have one in the radiator too? I don’t remember seeing one in the radiator? I just wanna make sure I get the right one. Never did one before in this type of car.
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Friday, August 21st, 2020 AT 2:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, did you find the sensor with the color wires I listed in the diagram?

Roy
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Friday, August 21st, 2020 AT 2:57 PM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
No, I will do that. I just wanted to know what that was. I will let you know when I see it.
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Friday, August 21st, 2020 AT 3:02 PM
Tiny
ASEMASTER6371
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Okay, sounds good.

Roy
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Friday, August 21st, 2020 AT 3:43 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Here is a picture of a replacement coolant temperature sensor from AutoZone for your car. I've attached the picture below. In the notes from AutoZone it states the sensor is located in the radiator. You might want to check because sometimes our reference material contains mistakes. Hope this helps and thanks again for using 2CarPros.

Danny-
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Friday, August 28th, 2020 AT 4:01 PM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
Hi Danny, thanks for the knowledge. I did notice that on Rock Auto it seems like there are three sensors for this vehicle for the cooling system. One is located on the thermostat housing, other is on the radiator and in the rear of the head below the intake manifold. It’s confusing because Rock Auto says they are all coolant temperature sensors.
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Friday, August 28th, 2020 AT 10:02 PM
Tiny
ASEMASTER6371
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I believe the one in the radiator is for the fan controls for the cooling fans.

There also may be a sensor for low coolant level in the radiator as well.

Roy
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Saturday, August 29th, 2020 AT 11:51 AM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
But the coolant temperature sensor for the engine temperature is in the rear block?
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Wednesday, September 2nd, 2020 AT 9:40 AM
Tiny
ASEMASTER6371
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That is correct.

Roy
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Wednesday, September 2nd, 2020 AT 10:08 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Considering there are multiple sensors for your car that control multiple functions we need to ask you what the symptom is. Are the fans not working? Car overheating? Gauge on dash not working? Knowing what the symptom is will help us point to which sensor to replace. Hope this helps and thanks again for using 2CarPros.

Danny-
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Wednesday, September 2nd, 2020 AT 1:48 PM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
I was having my coolant temperature sensor on my scanner not giving me a reading in specs. I had replaced the thermostat housing with the sensor in the housing a year ago. Every other sensor for the cooling system is original. So I wanted to replace the temperature sensor to save me time in the future. But I had to ask first because I seen 3 sensors for the coolant temperature and was confused.

Rock auto doesn’t state which sensor goes into the block. It just says use together with the one matching originally.
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Wednesday, September 2nd, 2020 AT 3:34 PM
Tiny
ASEMASTER6371
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Did you check the voltage at the sensor?

Roy
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Wednesday, September 2nd, 2020 AT 3:36 PM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
No I did not. The question I have is, is the sensor hard to get to or do I have to jack the vehicle off the ground to gain access to it?
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Wednesday, September 2nd, 2020 AT 3:38 PM
Tiny
ASEMASTER6371
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I will be honest. It is tight to access.

Roy
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Wednesday, September 2nd, 2020 AT 3:51 PM
Tiny
COOLOLDS85
  • MEMBER
  • 173 POSTS
So you’re saying it would be complicated to get unless it was on a lift? Jack stands wouldn’t be easy to get to it? And the voltage of a good temperature sensor is 5 volts, correct?
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Wednesday, September 2nd, 2020 AT 7:48 PM
Tiny
ASEMASTER6371
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I got them from the top. I lay over top of the engine to access it.

Yes, put your voltmeter in both leads when testing. Red lead on one terminal and black in the other. That way you are testing both wires.

Roy
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Thursday, September 3rd, 2020 AT 3:49 AM

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