Coolant temperature sensor location

Good evening,

I assume it is the 6 cylinder as there is no 2.1 motor.

I attached pictures for you to view. It is at the right rear of the engine.

Roy

The passenger side at the back of the motor. Yes, it is difficult to access.

Roy

Temperature sensors have an extremely low failure rate because there is just one part inside them. What kind of problem are you trying to solve?

First you need to list the exact diagnostic fault code number. There are multiple codes for temperature sensors, and they mean very different things.

Also be aware that fault codes never ever say to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code about half of the time. Before we waste your money on a part, we have to rule out wiring and connector terminal problems, and mechanical problems related to that part.

The coolant temperature sensor is number three on the drawing. It sits just under the valve cover, and just above the exhaust manifold. The arrow at the top left is pointing toward the front of the vehicle, so this view should be as though you were standing just behind the passenger-side front wheel. The sensor will be at the rear of the engine, on the passenger side.

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken

Hello,

Yes the sensor is in the same place.

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

Hello,

Here is the coolant temperature sensor for both engines and a guide to give you an idea of what you are in for when doing the job.

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

Here are the diagrams (below)

Please let us know what happens.

Cheers, Ken

P0128 - ECT below thermostat regulating temperature,

Coolant temperature sensors are usually near the thermostat housing. Code 128 is set from the readings from a properly-working coolant temperature sensor.

I tried multiple times to resize the image, but it always comes out the same. The CTS is item number 1. I added a red arrow pointing to it.

If you do not mind me jumping in here, I would suggest putting in a new thermostat with the OEM temperature rating. My Blazer throws this code when I am running a lower temperature thermostat or when the thermostat fails and gets stuck in the open position. The engine coolant is at too low of a temperature.