I'm not getting any heat no matter how I the settings are; someone told me that
the the heating filter could be bad. I don't get heat on either side in any
1. Check radiator coolant level. Really low coolant can prevent it from heating the core properly; a failed thermostat will act similarly. An air bubble in a heater line can block fluid passage..... 2. The ductwork has blend doors that move to get the temperature to the vent where you want it. Could be that the blend door that throttles between hot/cold is sticking because the door actuator is defective. You may have noticed a tapping sound under the dash from a defective actuator. Try a spray lubricant on the actuators, or remove them to see if there's a broken sprocket. Might need replacing. It's not a difficult fix.
Seems to be a common problem with explorers of your generation. Blend door actuator (electric motor) has plastic teeth. When one breaks, you get the clicking noise. When a few more finally give way, the door will not respond because the motor just spins. The net should have a lot of videos on the subject.
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