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?

[Galcobar]

A $10 multimeter can save you hundreds of dollars in parts. Check the sensors before you go about replacing them.

The thermostat is cheap, but you also have to replace the coolant lost from disconnecting the return hose. The thermostat is inside the metal section of the return hose, against the engine.

Lagos, thank you for remembering the heater temperature. I knew I was forgetting something.

Bleeding the cooling system is done with the radiator cap off and the cabin heat on, which forces out any bubbles trapped in the heater core. Keep topping up the radiator as the bubbles rise to the radiator neck or you'll just introduce more air into the system. Preferably, have the front of the car slightly elevated to encourage the air to exit, though that's not absolutely necessary.