high idle then overheat

[tsi009]

Today when get car warms up so i can go to work. Suddenly my car idle at 2k rpm. I checked all wires and hoses, nothing come loose. I thought it will warm up the car. So i just drive off to work. THen idle settled down, but temp start to climbing. It got close to red so I pulled over to a friend's house and borrow his car. I poped the hood, and heard boiling coolant and steam coming out of coolant bottle. Did my thermostat fail or water pump or blow gasket?

 

[zero97tsi]

I'd check the thermostat. They arent that hard to check. Throw it in boiling water, and go from there.

 

[architechnik]

Note: It should be fully open right as the water starts boiling. The actual temp should be 195F or 88C, which water boils at 212F or 100C

 

[Matt4g63]

Is it freezing where you live? Whats your coolant/water percentage?

 

[neoviper]

http://www.dsmtuners.com/forums/articles-engine-fuel/200575-help-im-overheating-heres-how-fix.html

This article should be really helpful

 

[tsi009]

Now my car idle normally after screwing a screw on top ot the throttle. But engine wont run if i let go of throttle, and radiator steaming and Temp still rising.