I have a 2000 ford taurus and the radio quit working and the heater come on when you start the car and the heater is off

We have a 1998 Ford Taurus that has the radio in an oval bezel that has the heater controls also on it.

If this is like your vehicle, then when you remove the radio using two coat hangers shaped like a 'C' then you can see where the electrical connections go for the fan and the heater setting.

The radio in our 1998 Ford Taurus started to malfunction with the volume level not being adjustable.

After taking the radio out, and putting it back in, a week later the problem went away, mysteriously, and to my surprise.

Hope this helps.