Replace the fan blower resister
It should be in the heater blower motor case which is located under the glovebox.
You can test your heater blower motor by connecting a ground wire to the ground. Connect a power wire, from the battery to the positive post. If the blower motor turns it is working, and if it does not it is bad.
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The heater blower motor on a 1999 Subaru Impreza is in the engine compartment on the passenger side of the vehicle. It is located on the firewall.
Turn the key off and remove it. Unplug the electrical connector at the heater blower, then unbolt the blower and pull it out. Place the new blower in position and bolt it into place. Connect the electrical connector, then start the car and verify that it blows.
Most likely a bad heater core
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i replaced my heater core and it has been fine ever since (8 months )