What was found
L SIDE WINDOW HEAT CAUTION ILLUMINATED AFTER TAKEOFF. QRH RESET SUCCESFUL. L SIDE WINDOW HEAT CAUTION LIGHT ILLUMINATED AGAIN AT 500' AGL ON APPROACH. GROUNDED - YES. TURNED L SIDE WINDOW HEAT ON AND WAITED APPROX 30 MINUTES. NO OVERHEAT LIGHT ILLUMINATED. PERFORMED L SIDE WINDOW HEAT BITE CK REF FIM 30-41 TASK 801 NO ACTIVE FAULTS FOUND AND NO FAULTS IN HISTORY. NO PREVIOUS HISTORY PAST 30 DAYS. OK FOR CONTINUED SERVICE.