GM Service Manual Online
For 1990-2009 cars only
    • GM vehicles are designed in order to operate under normal environmental conditions.
    • The design criteria for sealing materials and components takes into consideration the sealing forces required in order to withstand the natural elements. These specifications cannot take into consideration any artificial conditions, i.e., high pressure car washes.
    • The water leak test procedure has been correlated to the natural elements. The water leak test procedure will determine 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 may 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.
    •  A leak around a door or a door window panel does not necessarily indicate a bad weather-strip. An adjustment to the door or door window may resolve the condition.