Locating Vacuum Leaks

1. Connect the test vacuum probe to the vehicles (Black) supply hose. Position the vacuum test gauge so it can be viewed from the passenger compartment.
2. Place the Mode in the Panel position and the Circulation control in the Recirculation position.
3. Remove the center instrument panel bezel.
4. Remove the center vent duct.
5. Remove and block the Supply (Black) vacuum line at the control. The test gauge should return to the calibrated setting of 27 kPa (8 in. Hg). If not, there is a leak in the Supply line.
6. If there is no leak in the Supply line, reconnect it to the Control and remove the Actuator Feed (Red) line from the Control. Block the vacuum connection on the Control from where the line was removed. The test gauge should return to the calibrated setting of 27 kPa (8 in. Hg.). If not, there is a leak in the Control.
7. If there is no leak in the Supply line or the Control, reconnect the Actuator Feed (Red) line to the control. Remove and block the Actuator Feed (Red) line at the Actuator. The actuator vacuum port is accessible behind and above the Glove Box. The test gauge should return to the calibrated setting of 27 kPa (8 in. Hg.). If not there is a leak in the Actuator Feed line.
8. If there is no leak in the Supply line, Control, or the Actuator Feed line, the leak must be in the Actuator itself. Connect the Vacuum hose from the Vacuum Test Gauge directly to the Actuator to verify the leak.