Air Dog has worked great up until today. Turned the key over this morning and I didn't hear the motor on the Air Dog turn on. The unit is about a year and a half old. Has anyone had this problem with their Air Dog? Does anyone have any ideas as to what I could check? I have power to the harness on the Air Dog, and not sure what to check next. Maybe the motor burned up, and I need to buy another unit. Thanks in advance for any advise. -LJ