Could be a bad fan motor resistor
Typically a relay or resistor. But could be a blower switch or blower motor problem.
This may be a cause... My wife's 95 contour had to have the vacuum temp settings control unit replace 2 times. If you are constantly changing settings it really blows the valves in the climate control center... Just a thought.
A fuse blows when there is a short circuit or an overload in the circuit.
Whats the problem? Blows cold air with the heat settings on?
If you are saying the blower motor only works on the high speed setting, then the problem is a bad HVAC Resistor Pack.
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
Dissconnect the battery for 1 hour and reconnect, should re-set the flaps!
if it blows it top it can kill but otherwise no problem
it's a problem with the blower motor resistor
check you thermostat for the temp setting
Try getting it recharged.
brake lgiht fuse blows when shifting gears?