F150 Lariat Heater Not Blowing Hot Air?

I have a 2004 Lariat F150. My blower is working fine, but my temp will only work at 90 degrees for the heater and the cold air is working fine. Can anyone tell me what the problem is?

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Judy
Gold Post Medal for All Time! 677 Posts

October 1, 20170 found this helpful

Some reasons the heater may not be working.

Low coolant level on a vehicle due to a coolant leak
Thermostat that is stuck open.
Plugged or leaking heater core.
Heater blower that is not functioning.
Blend doors that are not functioning

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