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Tahoe / Yukon Service Manual

Air Pressure Test

  1. Close all the windows.
  2. Turn the vehicles ventilation fan to the on position, with the selector on high speed and in the defrost mode (or panel mode with fresh air vent on - no recirc).
  3. Unlock and close the doors.
  4. Listen for escaping air along the door and the window seals with a stethoscope or a length of heater hose.
  5. If unsuccessful in identifying the leak path, consider masking off the pressure relief valves (to increase cabin pressure) and perform the evaluation again.