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Why does heater on 98 Ford Explorer blow out cold air even if switch is turned to hot?
Wiki User
∙ 12y ago
Low coolant?
Bad Thermostat?
System "airbound"
Defective heater control cable?
Plugged heater core?
The most common reason is a broken blend door in the plenum box. Check the video on YouTube for information on diagnosing and repairing the system. Search "explorer heater" to find the video.
It is either a broken blend door, or a broken actuator motor. Typically to fix this problem, a mechanic will disassemble the entire dash, and replace the plenum box. Unfortunately this is an expensive fix because it is labor and parts intensive. There is a DIY solution called heatertreater. They provide instructions on how to access the blend door by removing the glove box, and replacing the blend door without removing the dash and plenum assembly. Broken blend doors are a common problem among Ford explorers, and most heating and A/C issues in late model Ford explorers are directly caused by a malfunctioning blend door.
Read more: 2004%20ford%20explorer%20heater%20problems%20clikcing%20noiseThat is why Aluminum blend doors, recirculation doors and modes doors should be preferred over plastic or steel blend doors.
Read more: 2000_ford_explorer_heater_fan_motor_makes_a_noise_like_a_leaf_is_in_it
Wiki User
∙ 12y ago
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