Air Delivery

(Perform before beginning System Diagnosis)

(Engine warm and running in idle)

1. Check manifold vacuum at the Black hose from the Engine on the Vacuum Tank.

^ If vacuum is not present, check the hose back to the Engine Vacuum Source.

^ If vacuum is present, check for vacuum at the Black hose at the Heater and A/C Control Head, replace Vacuum Tank.

2. Check that the vacuum hoses from the Heater and A/C Programmer to the Vacuum Actuators are connected and in good condition.

^ Go to the Overall System Check for a guide to normal operation and diagnostic references. System Check - RPO C68

^ Go to System Diagnosis for diagnostic tests. System Diagnosis - Air Delivery