when you do replace the air mix actuator,
This will help you with calibration. Start by turning the temp to the maximum heat setting.
Wait until the actuator arm moves all the way to the right. Move the airmix door all the way to the right, hold it there, and then snap down the metal connecting rod to connect the actuator arm and airmix door arm.
Next turn the temperature to the maximum cool setting.
Watch the action of the actuator arm, connecting rod, and airmix door arm as a whole for smooth, quiet motion throughout the full range. Verify that the airmix door moves all the way to the left.
Then set your temperature to the desired setting. Turn off the ignition and restart the car. Either let it idle for a few minutes or take it for a test drive to verify that the ECC has stopped blinking. If it has, then you are set to enjoy air at the correct temperature again!