I had a friend who was duck hunting this weekend and his tell tale hose kept freezing up on him when he would shut the motor off for a period of time. He said when he would start the motor water would come out of the exhaust holes but not the tell tale until they had sucked on it for a while or blew air from their mouth up it for a while. Is there anything to do to prevent this other than picking a warmer day to duck hunt?