Nissan Repair: front heater, blower motor, control switch

Question
the fan only runs on no4 ,it worked yesterday when i turned the slide to red but not now,i have been told that there is some sort of drain plug for the heater ,but i dont know where it is ,do you ?

Answer
Andy,

The fan resistor cluster needs to be replaced from what you said in your first comment.  Secondly, if the fan no longer works at any speed I would be looking at the blower motor or the control switch.  The drain is under the car below the heater and airconditioning box on the passenger side of the firewall.  Open the hood, look down, on the passenger side, of the firewall and you should see a small black tube.