Vanden Plas L6-4.2L (1982)
Vacuum Sensor / Switch HVAC: Testing and Inspection
Servo Control Unit
VACUUM SWITCH (Inner) SERVO CONTROL UNIT
Testing:
In full cooling mode check vacuum supply to water valve.
If none available, check at (inner) vacuum switch on camshaft. Supply pipe color code = White - Red pipe to water valve.
VACUUM SWITCH (Outer) SERVO CONTROL UNIT
Testing:
In full cooling mode check vacuum supply to (outer) switch on camshaft. Bypass switch and observe that center dash flap opens.
Supply pipe color = White - Pipe to center dash flap = Black.
