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The blend door blends the hot air with the cold air to produce the temperature you have selected on the temp control switch.
The temp blend door. It is electrically controlled by an actuator. It is located behind the dash assembly.
If you are asking about the temp blend door actuator, it is behind the dash assembly, attached to the HVAC box. Removal of dash is required.
Behind the dash assembly, mounted to the HVAC assembly. The dash assembly must be partially removed to gain access to the blend door actuator.
It's a temp blend door and actuator, and it is located behind the dash assembly, connected to the HVAC box. The dash assembly needs to come out to access the blend door actuator.
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 entire dash assembly needs to be removed to gain access to the blend door actuator. Big job, suggest acquiring a shop manual of you plan on doing this job yourself.
There is a fair amount of work to gain access to the temp blend door actuator. The dash assembly needs to be removed. Too many steps to list here. Suggest purchasing a shop manual for that vehicle if you intend on doing that job yourself.
The temperature blend door and actuator is located behind the dash assembly. The dash assembly needs to be removed to gain access to the blend door assembly.
You didn't mention what year Blazer you have but in most cases the blend door actuator is located on top of the HVAC box that is located behind the dash assembly. Unfortunately, the entire dash assembly must be removed to gain access to it.
If you are refering to the temp blend door actuator, it is located behind the dash on top of the HVAC box. The dash assembly must be removed to gain access.
under the battery, remove the battery and battery tray