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Water Hose Test

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Water Hose Test
G01616757Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Use a water hose without the nozzle attached.
  1. Have an assistant inside of the vehicle in order to locate the leak.
  2. Begin testing at the base of the window or the windshield.
  3. Slowly move the hose upward and across the top of the vehicle.