System Diagnosis - Temperature Controls - RPO C68

Diagnosis for this system is based on the diagnostic codes stored in the Heater and A/C Control Head. When a code has been stored the MODE indicator (LED) of the current mode will flash. Three dashes will be displayed on the Heater and A/C Control Head if the A/C Programmer fails. For code diagnostics, refer to Diagnostic Trouble Code Tables.

If Heater and A/C Control Head and/or Programmer appear completely inoperative, refer to "Overall System Check," and perform Chart # 2.
System Check - RPO C68