you want the heater core turning to get any air out.

 

I see... I think I might have to bleed mine and do that.

In the mornings I can hear something that sounds like water moving behind the dash... Maybe there is an air pocket in there, allowing the coolant to splash around.

 

before you start the car take the rad cap off. Then run have the heat on full blast. Once the thermostat opens up coolant will begin moving through the system. Let it run for a few minutes like this. You will begin to see the coolant level drop down and you can top it off

 

If you have a large plastic hose (pref clear) you can put that on the radiator kind of as a reservoir. The air will find the highest point and will bubble out of your radiator. This can cause splashes. Hose will help prevent that.

Picture purely for reference.