Beeping sound when starting/running International Terrastar w/Maxforce

Door not closed.

 

Maybe it's because your air pressure is building up.

 

most likely it is air pressure and it stops when it gets over 60 psi

 

Did you check you blinker fluid? You might want to.
And your sand rail injector may need cleaning.

 

Is it beeping before you start or while you starting

 

Is it beepbeepbeep or beep beep beep? Very important.

 

If it's a long continuous beep it's likely low air pressure.

 

I know some internationals when you turn them off and crank them up, they sound like someone hitting a Kia or Hyundai horn about a 100 times