I have a 2005 Toyota Tacoma TRD I had leaves get into the a/c blower and ruin it. Still don't understand how leaves got there. Replaced it with a new one but now the lowest three fan selectors do not work. The high selector is fine. What the problem?

there is a blower motor resistor which gets cooled by the air in your duct. it is usually right by the blower. low and medium settings are run through the resistor and high is all 12 volts without resistor, i believe it will be a white porclain block once removed from the duct. i guess it could also be unplugged?