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Water Hose Test

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Performing Water Hose Test
GM95572Courtesy 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.