Sometimes when I start my car, usually after sitting for a few days or it being really cold outside, the coolant light comes on and it makes that really annoying noise. The problem is, it stays on for awhile, atleast until i drive the car around for about 2-3 minutes or more to warm the engine up, and then the light and sound goes away. When the light is on, the needle stays at C (all the way at the bottom). Does anyone have any idea about what might be causing this? The coolant is full in both the overflow and main coolant area.

-jwaingold

 

"main coolant area"?

Your buzzer is going off because the coolant level in your filer neck is low. The sensor will go off telling you to add coolant.

Check for coolant leaks in your hoses.

 

yeah, it means its low. The reason its turning off after you drive it for a while is because the filler neck fills up from it circulating. You need to add coolant and then check for leaks like Mr. FormerPorscheGuy said. And also burp the system, if you don't know how then do a search for it.