no heat A/c works

not getting any heat . Fans work as all controls , is there a valve and where is it located . I pulled controls from dash and temp switch rotates and changes air in vent.

Check to make sure the blend door is opening. After getting the car up to operating temperature, feel both heater hoses going to the heater core. They should both be about the same temperature. If one is significantly cooler than the other, you have a clogged heater core.