What was found
GOING THROUGH 13,000 FT, GOT WING OVERHEAT WARNING. REMAINED ON ABOUT 20 SECONDS, WENT OUT, THEN CAME RIGHT BACK ON, OCCURRED NUMEROUS TIMES. DECLARED EMERGENCY. RETURNED LGA. WING ANTI-ICE WAS NOT ON & ALL AOM PROCEDURES COMPLIED WITH. R & R THE OTBD TEMP SENSOR ON THE RT WING IAW AMM 30-12-08. OPERATIONS CHECKED GOOD IAW ETN-CR-30-004R2. AS A PRECAUTION, AILC WAS R & R IAW AMM 30-12-12, OPERATIONS CHECKED GOOD.