Extruder Fan Question (1 reply)

Hi everyone. I'm new here. I've searched the site trying to find an answer to my question and was not able to find anything. I have connected my extruder fan (the one that should always be ON when the extruder is heating) to the fan header as shown in the url shown below marked as "extruder Fan" I have another fan that blows on the object being printed to cool it which I have wired to D9. I control that fan's speed and such manually in Repetier host. The problem i'm having is that the extruder fan is ALWAYS on no matter if the extruder is on or not. I'm using Marlin 1.1.x and I assume that I need to set one of the following setting in the advanced tab but I can't figure out what PIN I should reference for that Extruder fan header. Any help would be great! Thanks!

#define E0_AUTO_FAN_PIN -1
#define E1_AUTO_FAN_PIN -1
#define E2_AUTO_FAN_PIN -1
#define E3_AUTO_FAN_PIN -1
#define E4_AUTO_FAN_PIN -1
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed

Extruder Fan Header