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the blower resistor is bypassed on high. a direct path to ground. if high is the only operational speed the resistor is bad.
Sounds like your Blower motor resister, it controls the voltage to your blower motor, controlling the speeds, if you always have it on high, med ect. that speed is more likly to burn out first
If the blower runs on high it will get hot. If the blower is wearing out this will cause it to get to hot and blow.
more than likely the blower motor resistor is out. it uses resistors to reduce the voltage sent to the fan to make it spin slower when the resistors go out on low and med your are left with high witch is battery voltage 12v.
Replace the high speed relay.
Check the blower motor put the fan on and see if it blows on high if it doesn't replace the blower motor if it does blow high replace switch
The blower motor resistor is defective.
needs new blower resistor
More than likely the blower motor speed resistor burned out.
Blower Motor Resistor is bad. 20.00 part at AZ.
bad blower,buy a good one and replace
you need a new blower motor resistor