The following link may be of some help:
This particular episode was not directly about your problem but if you
scroll down to Fig. L - it will show you what the resistor looks like for a
blower motor. What happens is: When you set the switch [on your dashboard]
to the low or medium setting - the current to your blower motor passes
through this resistor and the blower motor doesn't run at full speed. If you
choose the high setting on your [dashboard] switch - the resistor doesn't
"slow" the current/voltage [so to speak] to the blower motor and you
experience your current situation. Typically the blower motor resistor is
located in 1. the engine compartment [usually near the firewall] or 2. in
the vehicle [usually under the dashboard].
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