Sometimes you're resevoir can have coolant in it but the radiator is actually low. Mine is kinda gay like that sometimes i dunno why. Maybe you should just flush the entire system to make sure you got the correct amount of coolant. Or you can just get a aftermarket race radiator and you wont have to worry about your fan coming on My fan rarely comes on. In the mornings the temp is about 1/5-1/4 way. When I then hit traffic and go to stop and go it goes to normal temps a little under half way. Wonder how it would be if I didnt have that damn intercooler blocking most of the air flow.