Coolant temperature sensor location

I have tried replacing the coolant temperature sensor, but that did not do anything. I replaced the thermostat. Now the next thing I’m reading about to replace is the coolant temperature switch, but I cannot find a location for that. Also I’m reading conflicting articles that the the two can be one in the same, but the auto parts store sold me a sending unit temperature switch that’s for my car but that had different wire terminals than the one I already attempted to replace.

The car has air flow, but it is not getting hot. Earlier today I put in a new sensor, disconnected the battery to reset the computer. When I turned on my car, the temp gauge worked and it had started to blow warmer air, never really got hot. After driving for about 10 minutes the temperature gauge stopped working, and the air coming out started cooling down. When I got to where I was going, I reset the computer again. When restarted it worked again, was able to turn off car and turn back on twice with it working/with air getting warmer, but when I actually started driving again the temp gauge stopped about 7 minutes in.

The car engine temp gauge stops working, my climate control is analog.

The coolant level is not low, but yes I am in cold weather. I had a scan done at auto zone. It came back with two codes. One saying engine temp low and one saying engine temp high. Since replacing the sensor on Monday I no longer have a check engine light on. And as of yesterday/ what I driven today my heat/temp gauge have been working. The only thing now, is my rpm is staying at 1 while in sitting in park, so tomorrow I am going to put in a new air filter.

I don’t have them, and I don’t think scanning it will tell me anything now that my check engine light is no longer on. My heat/temperature gauge keeps working on and off now. Every time is stops working, we disconnect and reconnect the battery and it starts working again. So now we’re trying to figure out why is keeps randomly stopping like that.

That is not something I have heard of yet, so I will definitely look into. While driving my car tonight, my check engine light came back on shortly after it quit working again. I will go to AutoZone tomorrow and get the codes as to why. Thank you so much for a suggestion as to what else it could be. It’s get too cold where I am not to have heat in the car.

So I took my car to Advance Auto, the code it came back with was P0128.