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The most common cause of a heater and air conditioner blower not working on a car is a faulty blower motor. Without the blower motor, the system is unable to push air through the vents inside the vehicle.
I woild be checking the vent controls as if the ac is working and the core was blocked then the air would be cool when the heat was selected but not changing Fixing the heater has resulted in a /c not being good enough to cool the air if the vent is not properly selecting. The point is that if the vent selection is not working properly (vacuum hoses) then the 2 faults will be related.
if the air started to work only on a few settings then the problem is your blower motor resistor if it just stopped all of a sudden then the blower motor is bad but the first thing i would check is the fuse. always check fuses first if you find a bad fuse for it and it pops rite after you put it in and turn the heater on then replace the blower motor
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