For 1990-2009 cars

1. Cover the pressure relief valve.
2. Turn the vehicle ventilation fan to HIGH.
3. Close all of the windows and doors.
4. Apply a soapy solution to all potential leak areas.
5. Look for bubbles that reveal escaping air.
6. Consider the following procedure as an alternative to pressurizing the vehicle interior:

6.1. | Use an air compressor air hose.

6.2. | Do not exceed 207 kPa (30 psi).