Overheating Options

[Moobit]

Not really sure what this can be. No signs of a leak.

I have 2 videos. Quality is just plain bad but it shows what i need to show.

One shows when it warms up. It is under C and then in a couple of seconds it goes up to norm operating temp.

http://www.youtube.com/watch?v=nq9B5FR-VGg

Second one shows when its at norm operating temp and then goes up slowly. Only seems to heat up at idle. As soon as the temperature goes up i accelerate and then the temperature suddenly goes back to normal.

http://www.youtube.com/watch?v=paE0S3BwTlg

Not sure if this might be a sensor problem. I have never really encountered this kind of problem where the temperature would change so fast.

Any ideas what it can be?

[Special_Edy]

I let the overflow tank get rid of any bubbles, thats what its there for.

All you have to do is start the engine and let it heat up. The coolant expands and pushes all the air out the radiator cap, through the overflow hose and into the overflow tank. When the car cools it will pull coolant back into the radiator instead of air.

This post has been edited by Special_Edy: Nov 17, 2012 - 7:45 AM

[Galcobar]

Fan next to the battery is the cooling system fan. The fan next to that is for the AC system. If the cooling system fan runs all the time, the coolant temperature switch (the sensor which activates the fan) is probably shot.

I let the overflow tank get rid of any bubbles, thats what its there for.

All you have to do is start the engine and let it heat up. The coolant expands and pushes all the air out the radiator cap, through the overflow hose and into the overflow tank. When the car cools it will pull coolant back into the radiator instead of air.

That works, but bleeding the system with cap off is much quicker and with greater assurance you won't over- or underfill the reservoir.