replaced the alternator, now my heat is not coming out of the vents when turned on

SHOULD HAVE BEEN A LIQUID COOLED ALTERNATOR. WHEN YOU REPLACED THE ALTERNATOR AND REFILLED THE COOLANT. YOU HAVE TO BLEED THE COOLING SYSTEM WHEN YOU FILL IT OR ELSE COOLANT WILL NOT CIRCULATE AND HEATER WIL NOT WORK. THIS COULD ALSO CAUSE ENGINE OVERHEAT WITHOUT GAUGE SHOWING OVERHEATING. TRY BLEEDING WHEN YOU FILL THE COOLANT. THERE SHOULD BE A BLEEDER ON TOP OF EXPANSION TANK AREA. REMOVE BLEEDER, FILL COOLANT UNTILL IT COMES OUT. SCREW BLEEDER BACK IN, START VEHICLE AND OPEN BLEEDER UNTILL NO BUBBLES. THEN HAVE HEATER ON FULL HEAT DEFROST. GOOD LUCK