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.

by in Carmel, IN on December 11, 2013
1 answer
ANSWER by on December 11, 2013
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.