I have the same on my 2002 3.0 87k miles. I noticed that my antifreeze was running low but there is no leak. I refill the antifreeze and reset the code. After around 1K miles the code came back. Now I just need to find time to do the service maintenance on my cooling system (change out the thermo, water pump, pulley, 2 hoses, flush the radiator). I wonder how much time it takes to do the procedure??? Anybody wants to help, I supply the beer (j/k).