Can I get a coolant temperature sensor wiring diagram?

RONAROLL

MEMBER
2010 CHEVROLET MALIBU
4 CYL
2WD
AUTOMATIC
150,000 MILES

I am replacing the coolant temperature sensor. The electrical plug in was also bad so I bought a new one. The existing wires coming into that plug were both yellow. I have to cut this to connect the new plug. I am not sure which wire goes on which side of the sensor. I have a 50/50 chance on getting this right. What if I don’t?

3 Replies

BORIS K

MECHANIC
762 POSTS

Hello,

The two wires leading to the ECT sensor are actually yellow and tan, see diagram below.
The sensor is a simple NTC resistor so the wiring can be attached either way.

Hope this helps.

Cheers, Boris

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Wednesday, July 13th, 2022 AT 2:38 AM

RONAROLL

MEMBER
12 POSTS

Thanks. What is the best method for splicing the wires? They are kind of hard to get to. Also do you know what the connection is under the sensor? It's about 4” long and light blue. And is just lying there loose. It has some king of ring, clip or whatever it’s called.

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Wednesday, July 13th, 2022 AT 9:19 PM

BORIS K

MECHANIC
762 POSTS

Hello,

I prefer using insulated crimp joints, see picture below. You insert each side wire into the joint, crimp it with a suitable tool and then apply heat to reduce the heat shrink to provide a waterproof joint.

A good video
https://youtu.be/i5LBf19MqPk

Could you please provide us with good, clear picture of the connection in question?

Cheers, Boris

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