PROBABLY THE BLEVIN DOOR MODULE LOCATED BEHIND THE HEATER CONTROL AND RADIO. FIRST REMOVE THE RADIO WITH DIN TOOLS AND THEN THE COVER FOR THE HEATER CONTROL MODULE WITH 7, OR 8 MM IT'S A WHITE PLASTIC BOX IF THE MODULE GOES BAD YOU MAY HEAR A CLICKING TRY TURNING THE LITTLE SHAFT IN THE BOTTOM RIGHT CORNER OF THE MODULE COUNTER CLOCK WISE SEE IF IT HELPS.
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Change the thermostat. Follow the top radiator hose to the engine. There is to T stat. That will get your heat back. on the defroster, it doesn't blow out air? doesn't switch vents? or just not get hot? Year make and model please.
there is a blower relay circuit board located right by the blower motor which sounds like your problem to me i've worked on several that had the same type problem and thats what it was. the two blower motor wires will plug into it and there are two screws that hold it on
change thermostat, how fresh is your 50/50 coolant, 50% water is what gives you heat, with thermostat, are all heat controls in correct position ? any obstructions in vent hoses, has debris fallen into defroster vents etc., are rad hoses in good condition ? weak hoses collapse and prevent flow. good luck
The blowers ion the back have there own blower motor. The front has it's own. The resister controls the range the blower motor runs on,( low, medium, high). If the blower motor is not working it may be the motor itself. Was the fuse checked:?
could be a blower motor resistor or a faulty blower motor. if no air is coming out of the vents when you turn the switch to on there is a fault in the electrical system somewhere. the rear blower system is pretty much totally separate from the front so therefor rear hvac is working properly. test blower motor resistor and blower motor current and see if its putting out any power also make sure the wires going to the blower motor are hot also.