2006 Toyota Sienna fan run and it is not running hot. Do not have heat.

What is your question?

in the Toyota it do not have heat. Can hear fan running, but the thermostatic gauge is steady. the needle ran high and then suddenly fell. After I put some anti freeze in it, the gauge went back to a normal, yet I can hear the fan steadily running. It do not leak at all. Check oil to see if there was any water in oil and if I blowed a gasket it was not. It smell as though it running hot if I drive it. Check engine light is not on. If you can help me to identify the this problem i will be appreciative, or if you can give some insight on what the problem maybe.

What makes this problem better or worse?

can not identify

How long has your 2006 Toyota Sienna had this problem?

month