Air Conditioner on 1999 Nissan Sentra

My air conditioner only works on number 4, the highest it can go. What could be wrong with it

by in Clifton Heights, PA on August 21, 2009
1 answer
ANSWER by , August 21, 2009
This is likely due to a failed blower motor resistor. The resistor controls the speeds 1,2 and 3, but not the highest speed.