Overheating strange alert

https://drive.google.com/file/d/1Wem7BC ... p=drivesdk
Check the video on my Google drive. I am driving to a long climb and the temperature gauge is doing this weird flickering. I don't know if it's overheated or not but it doesn't look normal to me that it goes 3-6 and 6-3 in matter of seconds. Also after 30 seconds it goes directly to 3 bars(normal level) not one by one.
I changed the temperature sensor green one but it did happen again today.
I'm not having any coolant loss and that makes me think it's not actually overheating.
Before changing the sensor or was an error code that was saying something similar with: A bad temperature circuit. That's why the mechanic said to try changing the sensor.
Any advice?

Hi

That's not normal.

Do you have air in the cooling system?

You may also have what the error said, a wiring fault with the coolant sensor.

C3CAR wrote: ↑Fri Jun 04, 2021 7:31 pm Hi

That's not normal.

Do you have air in the cooling system?

How do I know that if i have air or not?

frankoprifti wrote: ↑Fri Jun 04, 2021 7:32 pm

C3CAR wrote: ↑Fri Jun 04, 2021 7:31 pm Hi

That's not normal.

Do you have air in the cooling system?

How do I know that if i have air or not?

If you don't know what work had been done on the cooling system since it was last changed or it had been done improperly, then you may have air in there. Particularly if the odd coolant error happened just after work was done on the cooling system, then it could indicate there is air in there. There are some tips on bleeding the Citroen C3 cooling system in this topic.

C3CAR wrote: ↑Fri Jun 04, 2021 7:37 pm

frankoprifti wrote: ↑Fri Jun 04, 2021 7:32 pm

C3CAR wrote: ↑Fri Jun 04, 2021 7:31 pm Hi

That's not normal.

Do you have air in the cooling system?

How do I know that if i have air or not?

If you don't know what work had been done on the cooling system since it was last changed or it had been done improperly, then you may have air in there. Particularly if the odd coolant error happened just after work was done on the cooling system, then it could indicate there is air in there. There are some tips on bleeding the Citroen C3 cooling system in this topic.

Yeah i don't actually know of this has happened before i changed the coolant of my car as i dont have too much time with this car but as soon as i got it changed the coolant oil and stuff.. anyway thanks for the tip.

That looks like a bad electrical connection.
Check the green electrical connector on the top of the thermostat housing. Check it is not loose.

Ozvtr wrote: ↑Sun Jun 06, 2021 9:37 am That looks like a bad electrical connection.
Check the green electrical connector on the top of the thermostat housing. Check it is not loose.

Okay i will have a look and let's hope that's it. I'll post here if i solve that

frankoprifti wrote: ↑Sun Jun 06, 2021 9:39 am

Ozvtr wrote: ↑Sun Jun 06, 2021 9:37 am That looks like a bad electrical connection.
Check the green electrical connector on the top of the thermostat housing. Check it is not loose.

Okay i will have a look and let's hope that's it. I'll post here if i solve that

Checked the temperature sensor wires, and it looks like one of them was like broken somewhere because the other wire beeps when measured with a multimeter but this one doesnt. The strange thing was that it was beeping with another wire on the engine ecu you know different color. Tested touching the two wires together and it was giving the hot engine alert all 6 bars turned on. It looks like it was touching somewhere together while driving and thats why i think was giving the problem. Replaced that wire and then went uphill and tested it did goes to 4 bars because its a long hill with a lot of steepness but that was all it went down after the hill was done and its looking like the problem is sorted. Will post again if it makes the problem again.
Thank you