With most heaters in vehicles the blend door mixes hot and cold air together to give you the temperature you want. Thus the name blend door
Yes, it is possible the blend door is broken in the heat position.
need to know were the blend door actuator is for a 2002 gmc yukon on the drivers side , dual climate controls, rear air and heat
The temp blend door actuator is probably at fault.
There is actually 3 blend doors on the plenum. The blend door actuator is on the top of the case. It controls heat and cold air.
There is a temp blend door controlled by the temp control switch. The temp blend door is run by an actuator. If this actuator needs replacement it requires removal of the dash assembly (big job).
The temp blend door actuator is broken.
Blend door actuator.
Driver side temp blend door actuator has failed.
The blend door actuator is located behind the glove box, and a sign of failure is an audible "clicking" sound when you adjust your climate controls. The most common issue with heat or A/C in the late model Ford windstar is a broken blend door. A broken blend door actuator is almost as common as a broken blend door itself. Typically, the fix requires disassembling the entire dash and replacing the whole plenum box, which can be a costly repair.This details the best DIY option on how to replace a broken blend door or actuator, accessing the plenum box by removing the glove box rather than the entire dash.
This sounds like a temperature blend door problem - with the door stuck in the heat position. See "Related Questions" below for information on Taurus/Sable blend door actuator motors and blend doors
Could be, low on coolant, bad thermostat, plugged heater core, faulty temp blend door actuator,
Probably a faulty temp blend door actuator.