What would cause a 2003 Town Country van's heater fan to run all of the time?
A heater fan that runs anytime the key is on is usually caused
by a failed blower resistor. The blower resistor is located behind
the glove box door. You open the glove box and pull inward on the
stop bumpers on the sides to remove door. Look in and you will see
two plugs on the resistor. Unplug them, remove two screws, and
remove the resistor.