Disconnect the vacuum lines from the defroster vacuum actuator.
Rotate the defrost valve lever fully
rearward (counterclockwise), then carefully insert a screwdriver between the
bottom of the defrost valve lever and the protruding wall of the HVAC module
case below the valve lever in order to keep the valve lever in place.
Leave the screwdriver in this position until actuator is re-installed.
Lift to release the defroster vacuum
actuator retaining tab and begin to slide the vacuum actuator towards the
passenger side of the vehicle.
Carefully rotate the vacuum actuator upward and forward until
the actuator clears the instrument panel support.
Disconnect the vacuum actuator pushrod
from the defrost valve lever and remove the vacuum actuator.