On the passenger/top side of the radiator there is a sensor that just pushes into the radiator. Like a plug basically. Is this the coolant temp sensor? Mine was yanked out about a month ago after someone rear ended me causing my fan shroud to pop out of the grooves which yanked down on the wires going to that sensor. I remember pushing it back in and thinking "why didn't it snap in or anything". Yesterday it popped out again while driving only this time when I pushed it back in it snapped in place. Hopefully that fixed it.

 

Sounds like the coolant level sensor.

 

yes that's the low coolant sensor

 

There is a metal spring clip that allows it to snap in place and stay put. Make sure the spring "wire" is there.

 

Yup its your low coolent senser. Mines been busted for a year telling me that I need coolent, so I just unpluged it and vwala my coolent is fine now.

 

ya they're pretty notorious for giving false low coolant readings, had that problem on my car.

 

Thanks for all the responses. Like I said when I plugged it in this time it snapped in place so I think its good to go.