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If you have a variable speed blower motor, a bad motor speed controller can keep it running even with the key out of the ignition. See this post on blower motor controllers. https://ricksfreeautorepairadvice.com/blower-motor-wont-shut-off/
This system does NOT use a blower motor relay. Power flows from the IGN switch to the fan speed switch. Then from the switch to the resistor. Then to the blower motor and to ground #G206.
With the key in RUN, disconnect the electrical connector at the blower motor. Use your volt meter to check for voltage on the purple wire. If you're not getting power and the blower motor fuse is good, then you've got a wiring issue between the motor and the IGN switch. Check for power on the orange wire at the fan speed switch. That power is coming from the IGN switch. If not power, check for power right at the IGN switch on the orange wire. If no power there, you've got a bad IGN switch. If you're getting power, check for good ground on the grey wire. If not ground, clean the ground connection.
in review
the fan speed resistor is new
you bench tested the blower motor
12 volts test ..only runs it at full speed
if cabin filer want changed the blower motor would run hotter
could be the motor brushes or bush/motor bearing when slowed
you might want to inspect the brushes and clean the dust out of the motor
if no better
does that have climate control ?
might be the fan switch itself or the earth isnt so good
sounds like too me that blower moter goen out. winding goen bad. best way to check for this too find the wires leading to the blower motor diconned the wire use volt meter to check ohm in windings. should hve reading of OL. if get readin other than that bsd windingds in it.
Restricted air inlet or cabin air filter (if equipped), Defective blower motor and/or fan cage, A/C evaporator freezing up, debris in evaporator housing.
do all of the fan speeds work? if not you need to replace the blower motor resister. If all of the fan speeds work then you need to clean or replace your in cabin air filter. When this filter gets clogged you get very little air flow from your vents. Instructions for your cabin air filter service are in your owner's manual
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