Waterleak Test Preparation

Waterleak Test Preparation

* GM vehicles are designed to operate under normal environmental conditions.
* The design criteria for sealing materials and components takes into consideration the sealing forces required to withstand the natural elements. These specifications cannot take into consideration any artificial conditions, e.g., high pressure car washes.
* The water leak test procedure is similar to the natural elements and determines the ability of a vehicle to perform under normal operating conditions.
* The first step in diagnosing a leak is determining the conditions under which a leak occurs. If the general leak area can be found, the exact entry point can be isolated using a water hose or an air hose. Some trim panels or components may need to be removed in order to repair the leak.
* Leaks which are found around a door, a door window, a rear compartment lid or a liftgate area do not necessarily indicate a bad weatherstrip. An adjustment to these areas may resolve the condition.

Watertest Stand Assembly




1 - Pipe (0.5 x 36 in)
2 - Reducing Tee, Right Stand Only (0.5 x 0.5 x 0.25 in)
3 - Coupling, Left Stand Only, (0.5 in)
4 - Tee, Left Stand Only (0.5 in)
5 - Cross, Right Stand Only (0.5 in)
6 - Pipe to Hose Nipple, Right Stand Only (0.5 in)
7 - Female Hose Coupling (5/8 in)
8 - Input Hose, Right Stand Only (2.0 ft) (5/8 in diameter)
9 - Close Nipple (0.5 in)
10 - Cross (0.5 in) with Weld-On Cap (0.5 in)
11 - Nipple (0.5 x 12 in)
12 - Cap (0.5 in)
13 - Female Hose Coupling (5/8 in)
14 - Cross Hose (12 ft) (5/8 in diameter)
15 - Hose Quick Connect
16 - Pipe to Hose Nipple (0.5 in)
17 - Pipe (0.5 x 60 in)
18 - Water Pressure Gage, Right Stand Only
19 - Full Jet Spray Nozzle, No. 1/2GG-25 or Equivalent
20 - Coupling (0.5 in)
1. Assemble and position the water test stand as shown.




2. Set the nozzle height at approximately 1600 mm (63 in) from the floor. The water spray from the stands should overlap the vehicle as shown.
3. Place an assistant inside of the vehicle during the test in order to locate any leaks.
4. Maintain the water pressure from the nozzle at 155 kPa (22 psi) with a flow of 14 L (3.7 gal) per minute.




5. Test the windshield by aiming the spray towards the corner of the windshield, 30 degrees down and 45 degrees toward the rear.
6. Test the side windows by positioning the water stand towards the center of the rear quarter. Aim the water spray 30 degrees down and 45 degrees toward the rear.
7. Test the back window by aiming the water spray 30 degrees down and 30 degrees toward the front.