For 1990-2009 cars

Localized testing may be done either using water or air.

1. Begin the test at the base of the suspected area and continue upward slowly until the leak is located.
2. Pinpoint the leak area before any repair is made. Random repair may only temporarily restrict water entry and make future diagnosis and repair more difficult.
3. Continue localized testing in the same general area in order to confirm that all of the leaks have been located.