Question about 1998 Ford Explorer
The knocking noise is the key. Assuming the coolant level is correct, and the thermostat is working correctly, it sounds like you have a blend door actuator concern. If the knocking noise is coming from the center dash area, the blend door needs to be replaced. The radio and center trim will need to be removed, the blend door removed and the blend door needs to be manually moved to verify heat. Good luck.
Posted on Apr 09, 2011
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Posted on Jan 02, 2017
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