Marlin extruder auto fan

I downloaded my marlin version here [github.com] not sure actual version number, but so far everything else is working. So the big problem part is extruder auto fan not working correctly, I can assign pin and it basically works ok. I have tested this on ramps 1.4 pins D11,D4 and D40 just to make sure it is not in my head. Auto fan functions when extruder temperature is above set trigger point, this case 50, but when temperature goes above 50 assigned pin starts to blink once every minute or so. Would be nice to get this simple and helpful feature to work properly. Done some testing disabling pins on pins.h file but no luck, something messes this.

Aaannndd fixed sort of, it did remind me from PWM pulse and fan control uses software pwn. Unfortunately I have no use extruder fan PWM controlling, it is on or off, there is nothing more. Quick fix found on file temperature.c - temperature control and line 365 disabling line completely //analogWrite(pin, newFanSpeed); and now it works only on or off. Line above there is digital control, so everything looks and works like it should. There is always option to go back manual switch.

Did not fix this, when printer is idle longer, fan goes on and off, but stays mostly on. Useless feature I say.