When you move the selector over to "high"; on the inside of the control module, it's a pressure type of switch that when pressed down far enough, it is suppose to turn up fan. If the pressure type switch is worn out on the "high" side of this switch then of course it wouldn't work properly.
You dont mention what Engine or AUTO or MANUAL A/C . If AUTO A/C, Blower Motor Control Module is likely bad. If Manual A/C the blower motor relay is bad. The relay is near the blower motor taped to the harness.
Check the blower motor resistor.
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