Overheating while idle.
 

I've read a lot of posts about people's tegs overheating while idle, but none of them seem to have my problem, or maybe they haven't tried to do this.

95 LS auto.

Situation:

after 10 minutes of driving i was going through a drive thru and while i was idling the temp gauge almost went all the way to H.

As soon as i moved, im talking from one window to the next it dropped down to below 1/2 (regular). When i stopped it started going up again.

I thought maybe it was because i was in such a confined space (drive thru lane) :confused:

however, i stopped at a redlight and it started doing it again. It only does this when the engine is idle. if i stick it in neutral and revv the engine, the gauge drops. if i keep it in drive it goes right back up to H.

as soon as i hit the gas pedal it goes back to normal.

what could it be?

thanks in advance :)

It's most likely air trapped within the engine block.

With the motor completely cold, remove the radiator cap.
Start the engine and let it run with the cap off until the radiator fans come on.

During this time, with the coolant system unpressurized, any air bubbles will circulate up to the filler neck on the radiator and pop. If there's a lot of air in there, you may need additional coolant.

And as always, you don't want coolant to dry on any painted surface.
So don't go walking away. :)

How many miles? Could be a failing waterpump.

I will try that tonite after it cools down from driving home/or tommorow morning.

206,000 km's.. which i think is about 130k miles.