* HVAC Actuators (Blend Door and Mode Door Actuators): These control the direction and temperature of the air coming from the vents. They are located inside the dashboard, making them difficult to access. You'll likely need to partially disassemble the dashboard to reach them.
* Transfer Case Actuator (if equipped with 4WD): This actuator controls the engagement of the transfer case. It's typically located underneath the vehicle, near the transfer case itself. Its exact location will vary slightly depending on the specific 4WD system (part-time or full-time).
* Throttle Position Sensor (TPS): While not strictly an actuator, it's a crucial component that acts as a sensor and indirectly influences the throttle actuator. It is located on the throttle body, which is on the intake manifold.
To find the specific actuator you need, you'll need to know what system it's part of (e.g., "blend door actuator," "transfer case actuator"). A repair manual specific to your 1997 Chevy Blazer's engine and drivetrain will be incredibly helpful in locating these components. A Haynes or Chilton manual are good options.
