ABOUT 1 YEAR AGO, THE HEAD GASKET WAS REPLACED IN MY 94 4RUNNER V6 AUTO W/4WD. A FEW MONTHS AGO WE FOUND THAT THE RADIATOR HAD A CRACK BY THE NECK. REPAIRED THE CRACK. THEN A WEEK AGO FOUND DIFFERENT CRACK, OVER THE WEEKEND, REPLACED THE RADIATOR. REMOVED THERMOSTAT TO CHECK FOR ANY DEBRIS ETC. AFTER INSTALLING NEW RADIATOR, WHEN TRUCK IS STARTED IT BLOWS OUT WHITE SMOKE FROM THE EXHAUST. NOW THE DAY THIS WAS DONE, BEFORE RAD REPLACED, NO SMOKE, PARKED IT LET IT COOL, DRAINED AND R&RED RAD, STARTED IT AND IT BLEW A LOT OF SMOKE AT FIRST, THEN THE SMOKING SEEMED TO SUBSIDE. THE NEXT DAY WHEN FIRST STARTED IT BLEW SMOKE, THEN SEEMED TO QUIT. PLEASE HELP, NOT SURE WHET TO DO.