MERRY CHRISTMAS TO YOU ALL. NOW FOR THE PROBLEM-- WHEN IGNITION FIRST TURNED ON, WITH DIGITAL SET TO ANY TEMP THEN heater FAN STARTS TO BLOW BUT STOPS AFTER 2/3 SECONDS. IF I PRESS SWITCH FOR INSTANT HEAT FAN DOES NOT START. IF I SWITCH IT to manual operation it still only runs for 2/3 seconds. am driving around wearing coat and hat freezing in car.