wanted to share my experience here w/ other members...after general cleaning of my aircon (dual) i experienced the same condition as yours but not the front its at the back...no a/c blower on 1,2,3 speed but have on 4, technician check the switch but found the culprit to be the resistor block w/c can be repaired by replacing the FUSE located at the center, shape like a capillary tube ( i know doc otep can describe this shape) while at that moment electrical shop is far away from the shop the technician asked for a defective rice cooker w/c he sourced from there...whola...it works but i still bought new fuse from the elec. shop cost ony 30 petot plus small terminal-free...ride is starex grx auto climate control...HTH!