2003 Ford Taurus SES heat not working correctly?

The thermostat will be up to temp where it should be reading on my dash, I also have plenty of antifreeze in and I'm almost positive that wouldn't be my problem…

When I turn the the heat on I will get decently hot air blow out for a few seconds and then it'll immediately turn to cold air… What do you guys think?
Hopefully it's a fuse I'm thinking

Like Geo said, it could be the blend door actuator OR it could be the heater core. I have the 01 Taurus with the same issue. The engine would get up to temperature, I'd turn on the heat, and if I was lucky, I might get about 5-10 seconds of warm air before going back to cold air.

My dad took a look at it and said that it was the heater core that was clogged. We had to replace it and it now blows hot air. Unfortunately, replacing the heater core is rather labor intensive. When my dad worked at a local Ford dealership, they would charge $500+ to replace heater cores due to the amount of time it takes to get to the heater core.

HI so it's not so simple as a fuse. This suggests it is a faulty thermostat which is not opening fully and needs to be replaced.

You need to check the coolant level in the radiator. Not just the reservoir tank.
A bad blend door actuator that constantly moves from the hot position to cold position may also happen but it's not common.

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