Low speed (1-4) relay bad Switch bad Low speed motor winding bad
blower resistor is bad
Defective Blower Motor Resistor Pack.
the resistor for the blower motor is busted blower works on high with out it
blower resistor
Defective blower motor resistor pack.
when a blower motor only works on high, it is usually due to faulty resistor board. Should be located in the duct near the blower. the purpose of this is so the air blown by the blower keeps the resistors cool.
There is a resistor near the blower that is bad, known cause is high speed only.
If you are saying the Blower Motor only works on high, then your problem is a defective Blower Motor Resistor Pack. Replace it.
Blower switch and connection had a melt down.
A blower motor that only works on high is normally caused by a defective Blower Motor Resistor Pack. DRL, do not have a clue.
Check for a bad blower resistor at blower motor
replace the blower motor switch