A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH 2 RPTS OF R BODY OVERHEAT WARNING ILLUMINATED. CLRED RPT BY DEFERRING THE R PACK.

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RECEIVED FIRST CALL TO ACFT 3 MINS PRIOR TO PUSH FOR A R WING TO BODY OVERHEAT LIGHT ILLUMINATED. OPENED R PACK BAY DOOR AND RAN PACK AND INSPECTED FOR LEAKS. NO LEAKS OR DEFECTS FOUND. LIGHT WAS EXTINGUISHED AND DID NOT ILLUMINATE WHILE I SIGNED THE LOGBOOK AND RELEASED THE ACFT. RECEIVED SECOND CALL TO ACFT FOR R WING TO BODY OVERHEAT LIGHT ILLUMINATED. AFTER TALKING WITH PLT (CAPT); DETERMINED THAT LIGHT ONLY ILLUMINATED AFTER R PACK HAD BEEN OPERATING. WHEN PACK WAS SHUT DOWN AND LET COOL; LIGHT WOULD EXTINGUISH. I REASONED THAT OVERHEAT DETECTION SYS WAS WORKING AND FAULT WAS BEING CAUSED BY THE R PACK FOR AN UNDETERMINED REASON. THAT IS THE REASON I PLACARDED THE R PACK AS AN MEL 21-1. SUPPLEMENTAL INFO FROM ACN 613467: HE DETERMINED THE PROB WAS WITH THE R AIR CONDITIONING PACK AND AS IT WAS DOWNSTREAM OF THE PACK VALVE; INOP'ING THE R AIR CONDITIONING PACK WAS THE CORRECT PROC. I AGREED. THE NEXT DAY; PER TELECON WITH MAINT; THE SUPVR INDICATED TO ME THAT WE NO LONGER DO THIS. OK; I AGREE. 1) ALL MAINT AND PLTS SHOULD BE FAMILIAR WITH THE PROPER FAA PROCS REGARDING 'WING BODY OVERHEATS.' 2) NO ACFT WITH AN ACTUAL 'WING BODY OVERHEAT' SHOULD DEPART A COMPANY MAINT BASE. 3) THIS PROB CONTINUES TO OCCUR AND WITH SUMMER APCHING; A CONFERENCE WITH BOEING ENGINEERS MAY BE APPROPRIATE.