Air Door Vacuum Solenoid Valve: Testing and Inspection
Vacuum SolenoidVacuum Solenoid:
Vacuum Solenoid:
Testing: (a) With mode switch OFF", a supply of 12 volts to solenoid pink lead connection should be present. If so, and the solenoid still fails to operate, replace solenoid.
(b) If solenoid functions correctly with mode control "OFF" but does not function when the servo camshaft is in the full cooling mode, the high speed/recirculation switch is suspected. If this component functions correctly, check Diode (D3) and associated wiring for continuity.