If your 1998 Expedition is not blowing hot air, it could be due to several issues. Common causes include low coolant levels, a malfunctioning thermostat, or a faulty heater core. Additionally, check the HVAC controls for proper operation, as electronic issues can also prevent hot air from circulating. A thorough inspection of these components is recommended to identify the exact problem.
So what is the question ?
the heater matrix is blocked
From what I've been able to find out researching our 97 Expedition, the cabin air filter is not a factory installed item. If you have one, it would have been dealer installed.
ONE OF THE HOSE WAS BROKEN AND NO ANTI-FREZEE
Sounds like you need to replace the thermostat.
I put free on in.but still blows hot air
Auto Climate control? If so it is a self-diagnosisng component- you will have to get codes and sequence from library or dealer--normally a blend door problem If not auto climate--check temperature control cable to see if bound or broken
Have you replaced the thermostat?
98 expedition
because the air conditioner is 98 degrees
5x135
Check the Blender door... Also check the temp knobs they make be broken.