2009 ranger heater runs cold -coolant good, hoses hot, engine hot

engine temp is mid range on gauge; both heater hoses are hot ; coolant level is full; runs cool all the time ; ac works fine; not sure heater valve is working can’t see lever -removed vac line don’t feel any vac; don’e hear any door movement when changing temp gauge; coolant condition is good as measured via volt meter. any way to check the actuator/door?