MD80S ACFT PREFLT. RPTR CAPT NOTICED WRITE-UPS ON WINDSHIELD HEAT; FELT THE WINDOW AND IT WAS NOT AS WARM AS OTHER 2. MAINT NOTIFIED WHO SAID THE WINDOW HAD BEEN REPLACED CAUSING IT TO HEAT SLOWER. RPTR ACCEPTED ACFT AND DEPARTED TO FIND ENRTE THE WINDOW WAS COLD AND APPARENTLY WROTE IT UP ALSO. AFTER 6 WRITE-UPS RPTR SAYS A PLT FINALLY ENCOUNTERED ICING AND WAS UNABLE TO SEE OUT THE WINDOW.

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AFTER ARRIVING AT THE ACFT FOR FLT; I TURNED ON WINDSHIELD HEAT AND PERFORMED MY NORMAL PREFLT PROC. AFTER REVIEWING THE LOGBOOK; I NOTICED SEVERAL WRITE-UPS ON WINDSHIELD HEAT ON THE CAPT SIDE. THEREFORE; I CHKED MY WINDSHIELD AND NOTED THE CTR AND FO WINDOWS BOTH FELT NOTICEABLY WARMER. MAINT WAS NOTIFIED AND THE FIRST MECH WHO CAME OUT CHKED THE WINDSHIELD ON THE OUTSIDE AND SAID IT WAS WARM BUT NOT HOT LIKE THE OTHER SIDE. THEN ANOTHER 3 MECHS SHOWED UP AND 1 OF THEM I BELIEVE WAS A SUPVR. HE BEGAN TO REVIEW THE LOGBOOK AND THEN TURNED TO ASK ME WHAT MADE ME THINK THERE WAS ANYTHING WRONG WITH THE WINDOW HEAT WHEN IT HAD NOT BEEN WRITTEN UP BY ANY OTHER PLT IN THE LAST 5 DAYS. MY RESPONSE WAS THAT THERE ARE NO WARNING LIGHTS AND WE NORMALLY DO NOT CHK WINDSHIELD HEAT ENRTE. THE MECH THEN WENT ON TO EXPLAIN THAT A NEW WINDSHIELD; WHICH HAD BEEN INSTALLED IN ORDER TO TRY AND FIX THIS PROB PREVIOUSLY; WAS THE REASON WHY IT HEATED UP SO SLOWLY. WELL; AS NO SURPRISE TO ME; AFTER WE WERE ON OUR WAY TO SMF; THE WINDOW BECAME COLDER AND COLDER AND WAS UNABLE TO MAINTAIN NORMAL OPERATING TEMP ENRTE. UNFORTUNATELY WE WERE NOW LOOKING AT FIXING THE PROB AT AN OUT STATION OR MEL THE WINDSHIELD HEAT; WHICH DOES NOT ALLOW FLT INTO ICING CONDITIONS. HOWEVER; WE WERE LUCKY THE ICING CONDITIONS WHICH DFW HAD EXPERIENCED ALL MORNING WAS NOT A FACTOR IN CANCELING FLT BACK TO DFW. UNFORTUNATELY IF YOU LOOK ON FORWARD TO FLT X IN MARCH YOU WILL FIND THAT A PLT FINALLY ENCOUNTERED ICING CONDITIONS AND WAS UNABLE TO SEE OUT HIS WINDOW. WHAT I WOULD LIKE TO KNOW IS; WHY THE MECHS WERE UNABLE TO FIX THE PROB WITH OVER 6 WRITE-UPS; AND MORE IMPORTANTLY; IF IT REQUIRES A CHANGE IN PROC; OP; OR MODIFICATION OF THE ACFT. THANKS FOR YOUR TIME AND CONSIDERATION.