where is the blend door and actuator located on 2003 Ford Escort

2003 escort zx2 no heat.
Thinking it is a blend door problem .Is there an easy way to check this?

Asked by for the 2003 Ford Escort
Cable driven door on this vehicle. Probably not at fault. With no heat, check the temperature of the coolant going into and coming out of the heater core. At normal operating temperature, those hoses should be very hot. If not, you could have a thermostat issue.