While driving the fan and ses light comes on. I've changed the temp sensor and checked the raditor level it's full. If I stop for a light the ses light goes out, so does the fan. Is there another switch or sensor that needs changing?

 

could be that the fan switch is bad. does it stay on or does it not come on?

a good idea is to buy a diagnostics scanner. they are good to have anyway, and they arent that expensive. it will tell you what is going on

 

SES light comes on after the car warms up. gauge reads right at or under the first line on temp gauge. When the engine cold it's off. One other question, Where do I find the fan switch?? Thanks.