With RPO C67

1. Check for vacuum to the Solenoid Box.
2. Check HVAC Fuse and CLUST Fuse.
3. Move the Temperature Lever to full Cold and then full Hot. Listen for the sound of the servo motor moving the valve through its full range.
^ Go to System Check for a guide to normal operation of air delivery and temperature controls. System Check
^ Go to System Diagnosis for diagnostic tests. Testing and Inspection