GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Manual valve (202)

Inspect for wear, sticking or binding. Replace the manual valve (202). Refer to Control Valve Body Assembly Disassemble .

Control solenoid valve assembly (201)

Inspect for contamination with debris. Replace or flush the control solenoid valve assembly (201). Refer to Control Valve Body Assembly Disassemble .