1969 Vacuum System Component Functions
| VACUUM RELAY VALVE CHECK | |||||||
|---|---|---|---|---|---|---|---|
| Control Head Setting | Tester Settings | Tester Should Indicate: | If not, check the following: | Electrical Diagram Probe Points: | Voltmeter should read | ||
| Function | Manual Control | Voltage | |||||
| Hi Front | Manual | Max. Cold | Transducer | With large vacuum hose from transducer connected to tester and open end of hose (green) removed from transducer closed off, vacuum gauge should indicate no vacuum. If vacuum is indicated, vacuum relay valve is defective. | |||
| VACUUM FUNCTION CHECKS | |||||||
| Hi Front | Manual | Max. Heat | Trans. | Hi Blower Outside air (air door closed to car body). Hot air from heater outlets. | Defective Power Servo; Leak in Vacuum System; Temp.; Door Link Disconnected or Jammed; Defective Vacuum Relay Valve | ||
| Max. Cold | Hi Blower Recirc. Air (air door open to car body) cold air from A/C outlets. | Defective Mode Door Diaphragm | |||||
| Component | Vacuum Applied | No Vacuum Applied | |
|---|---|---|---|
| Inside Air Door Diaphragm (Pink Hose) | Air Door Open to Recirculated Air (Car Body) | Air Door In Mid Position 50% Recir. Air 50% Outside Air |
|
| Outside Air Door Diaphragm (Purple Hose) | Air Door Open to Outside Air (Closed to Car Body) | ||
| Power Servo | Maximum Heat | Maximum Cooling | |
| Vacuum Relay Valve | Vacuum Applied to One Port Side Opens a Passage Through the Valve to Allow Transducer Vacuum to be Supplied to the Power Servo | No Vacuum Applied Closes Vacuum Supply to Power Servo | |
| Water Valve | No Water Flow Through the Heater Core | Water Flow Through the Heater Core | |
| Mode Door Diaphragm | Vacuum to Linkage Side | Vacuum to Covered Side | Airflow Out of Upper and Lower Outlets. Door Open 1" From 100% Lower Outlet Position |
| Airflow Out Heater Ducts | Airflow Out of Upper Ducts | ||
| Defroster Diaphragm | Full Airflow Out Heater Outlet | Full Airflow Out Defroster Outlets (Full De-Ice) | Airflow Divided 1/3 Out Defroster Outlets, 2/3 Out Heater Outlets |
| Transducer | Zero Voltage Applied to Transducer Results in Maximum Vacuum Supply | 10 Volts Applied to Transducer Results in No Vacuum Supply | |