For 1990-2009 cars

Important: Do not use solvent in order to clean the solenoid valves or the neoprene seals.

1. Clean the control valve body thoroughly in clean solvent.

Important: In the following steps, handle the parts carefully in order to avoid nicks and scratches.

2. Move the valves with a pick or a small screwdriver in order to dislodge any dirt or debris.
3. Use an air nozzle in order to dry the control valve body and to blow out all of the passages.
4. Gently probe the small passages with a piece of identification tag wire or the equivalent.