What does a wrench code on Dash mean 2008 Mountaineer

What is your question?

wrench light comes on driving on freeway, I push reset it goes out. Have checked floor for leaking nothing. But I have used a larger amount of antifreeze. Its not over heating. I was thinking i have a small leak at high speed pressure ,have not smelled anything yet.

What makes this problem better or worse?

reseting and it lasts for a while

How long has your 2008 Mercury Mountaineer had this problem?

one week