Fan on propane furnace not coming on
This is a guess from the prints, your ac is probably on the high speed winding of the blower and the heat is on the low speed of the blower, when in ON it may use the high speed winding try disconnecting terminal 4 to the motor and make sure it doesn’t trip the breaker , this would narrow it down to the blower motor winding And you could use just the high speed winding until you can afford to replace the blower.