GLAVAL IS RECALLING CERTAIN MODEL YEAR 2002, 2003, 2006, 2007, AND 2008 FORD E350/E450 UNIVERSAL, CHEVY/GMC 4500/5500 TITAN AND FREIGHTLINER MB-55 APOLLO TRANSIT BUSES MANUFACTURED FROM AUGUST 1999 THROUGH JULY 2007, AND EQUIPPED WITH A TRANS/AIR TA73 EVAPORATOR. THE EVAPORATOR UTILIZES A POWER RESISTOR TO REGULATE BLOWER SPEED. SHOULD A SHORT OCCUR IN THE “LOW OR MEDIUM SPEED” CIRCUIT WHILE THE BLOWER IS IN HIGH SPEED, THE SHORT WILL CAUSE THE SUPPLY VOLTAGE TO FEEDBACK THROUGH THE RESISTOR TO GROUND, NOT DRAWING ENOUGH CURRENT TO TRIP THE FUSE.