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IF YOU CAN'T FEEL THE AIR FLOW OUT BUT YOU HEAR THE BLOWER MOTOR WORKING, BEHIND THE GLOVE BOX IS A CABIN FILTER.REPLACE FILTER
IF YOU HAVE GOOD AIR FLOW BUT NO HEAT:
1;VACUUM LEAKING TO HEATER CONTROL
2;WATER PUMP GOING BAD / NOT CIRCULATING COOLANT,HIGH RPM/MORE COOLANT TO THE HEATER CORE
3;OPEN THERMOSTAT/ENGINE TEMPERATURE TO LOW
1;CHANGE THE DIRECTION FROM VENTS TO FLOUR TO WINDSHIELD. IF NOTHING HAPPEN IS THE VACUUM
2;RUN THE ENGINE INSIDE ON WARM PLACE ON IDLE.NOTE THE GAUGE IF PAS 1/2 TO 3/4. IF PAS 3/4 MARK REPLACE WATER PUMP
3;IF GAUGE STAY BELOW 1/2 REPLACE THERMOSTAT
You can jumper the fan motor to make sure it runs and if it does then look at the switch or resistor. You can also remove the resistor and omh acrossed it to make sure that it hasn't blown the fuse on risistor.
Either you have a blower motor FUSE that has gone bad "typically the problem" or you have a burned out blower motor. Usually the cause of a blown or burnt motor if not a Fuse, Is caused by the vented air from outside letting debris like sticks or leaves,acorns etc. enter the fan box. If ANY of the mentioned items get caught in the "blower box" then it will usually blow the fuse and or burn up the blower motor. Start in your fuse box and look for a burnt fuse and replace with same size fuse. If it blows the new fuse quickly then you have debris in "Blower box" that will have to be removed before adding yet another fuse. I have had the same problem and I found a bunch of leaves in my "Blower Box". I removed the leaves and replaced the burned out fuse. And I have had no more problems with the blower motor blowing air.
2 things come to mind: can you hear the fan turning?
if not check for power at fan location. If there is power and the fan isnt spinning replace the fan. If there is no power there is a problem with the fan circuit which includes wiring fuse (you stated were ok) and Fan speed switch (might be a module)
Or there is a blockage it is possible for your heater core and evaporator to plug up with dust .
on the front blower make sure the fuse is ok if it is then check the relay if its good as well then youll ned to replace the blower motor. as far as the rear it sounds as if the air handler is not operating properly you need to locate it and ensure that nothing is blocking it from turning.hopes this helps you.