First post & First time Honda owner.

My engine fan is not working even with the AC or Defrost turned on. Further, I only have heat at idle. When I start to drive the temp. gague drops to cool and there is no heat. When I stop the idle surges a little then evens out and the temp. gague begins to show warming.

The engine has never overheated. I left the radiator cap off tonight to burp the system. The blower motor works fine. At idle, the cooling system seems to flow well.

I am stumped. I will change the thermostat tomorrow but I don't think that is the problem. What controls the fan?