My 'Add Coolant' light is coming on intermittently (usually when I start the car), it stays on for a while, then disappears.

I checked the levels in the overflow and the rad and they are both full.

 

Check to make sure the wire connection on top of the radiator is secure.

 

Will do later today, thanks.

 

Check your rad caps too.. they may not be allowing the coolant to suck back into the rad when the car cools (IE they may not be sealing around the lip or the pullpack plunger in the middle is stuck.

check for pinholes somewhere in the coolant lines....

any conditions that allows air to enter the system (holes or loose caps) will not allow a vac to build inside the soolant system as the liquid contracts as it cools.. and then the coolant will not be drawm back from the overflow bottle... thus creating a headspace at the top og the radiator until the coolant expands as the car warms up again.

 

Also will do later today, thanks a lot!

 

Very good points and well explained.

 

man... i need to watch my typing... It must look like I'm a retard with a hairlip trying to order at a drive through window

 

LoL!

 

That thing is all the way at the top of the radiator and it seems like you can be two T-spoons low and the thing will go off. And that has got to be the most annoying sound in the world. I was out with a girl one time and it went off. I had just changed some hoses and I knew it was just air in the system. I pulled over unplugged it and stuck it on the frame of the car. Grounding it will silence it.