Hi! I Have A Nissan N16 L Series 2002 Model. Recently It Developed A Problem With Ac. No Matter Which Position Is The Ac Switch, Fan Runs At Full Speed. Its The Same Even When It's Off . Can Anyone Tell Me What Could Be The Problem? Will I Have To Replace Any Parts Or Just Get Them Repaired? In Either Case What Will Be The Cost?

check the resister. it is located in the heater motor fan unit under the dash. if you look under the passenger side dash you will see the wiring conection plugged into it. remove the resistor with 2 screws, disconnect it and see if the motor stops. have loads of problems with these corroding.