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.