When I got into my 1998 Mountaineer the other day and started it up I saw that my 4WD High and 4WD Low lights would blink six times and then stop. They would blink again a few minutes later and continue to blink six times and turn off until I turned off the car. Has anyone else ran into this problem? I leave the 4WD knob in auto and haven't really messed with high or low so I'm a little lost.