Ok yesterday my Add Coolant light and buzzer came on for about 2 minutes, then went off. Today I start the car, and as soon as it idles down to 1K or so the light and buzzer come back on. I checked the coolant and it's right in between the Full and Empty one. Should I just fill it to full or what's going on?

 

Check to see what the level is in the upper hose (WHEN COLD!). If it's not full, fill it and bleed the air out of the system - and keep an eye on it.

If it's full, check the coolant level sensor by grounding it - the buzzer should go off.

If the sensor is working and the coolent level drops when you run it, get a pressure test and prepare for a rebuild.

Z

 

Ok, turns out I had to replace the upper radiator hose and run some crap through the radiator, I have a leak somewhere, now I don't.