No heat. Its like the A/c is stuck on. What can I check??? on 1999 Ford F-350 Super Duty

I have taking the dash about an checked all controls.

Asked by for the 1999 Ford F-350 Super Duty
Check engine temp, should be at least 180deg. Check coolant level, has to be completely full. Make sure the heater hoses on both sides of heater core is hot to the touch with engine at operating temperature.