The following messages keeps appearing on the dashboard of my 2001 passat. STOP ''CHECK COOLANT'', I had the car scanned for codes, but there was none. the temperature guage is normal. the electric fan works allright and there is no leakage in the cooling system, the level is fine. I had the radiator cap replaced but the problem still persists. What could this be? could anybody help with this?
Thanks in anticipation.

 

Did you ever figure out what the problem was?