Sounds like either the fan speed switch or the fan motor itself might be bad.
Motor hasseized.
2006 Ford Focus rear defroster keeps blowing the fuse immediately after replacement
there is a short somewhere in dash or heater, you need to fix that to stop fuses blowing
yes, but bet on a short in your wiring.
A fuse that keeps blowing is an indication of a malfunctioning ignition. The ignition may be the culprit or the wiring leading to the ignition may be the problem.
there is a short somewhere in that circuit, look for broken or frayed wires, you'll have to pull it all apart
it was the fuse. it is in the glove box it is maked (cluster) 10 amp fuse fixed it all.
Obviously, if any fuse keeps blowing there is a serious fault in that circuit.Take it somewhere they can fix it.
Compressor may be locked up.
You need to find the cause of the short.
fuse keeps blowing
You have a short current somewhere. You have basically check all wires around the blower, temp gauge and retractor.