With RPO C60/C67/CJ3

1 If the Heater and A/C Control is completely inoperative, check for poor connection at Heater and A/C Control Connector C1.
2. Check fire missing or damaged connector seals at the Blower Motor Relay.
3. Check Fuse 24 if the Blower Motor is inoperative. If open, check for short to ground through CKT 41.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to General Troubleshooting Procedures). Diagnostic Aids
^ Refer to System Diagnosis. With RPO C60/C67/CJ3