Vacuum Control Motors

The vacuum control motors (18A318) control the position of the doors directing the air flow to the different outlets. There are two types of vacuum control motors used in this system:

• Single-diaphragm for air inlet and windshield defroster door operations.
• Double-diaphragm for air damper door operations.

Single-diaphragm motors have two positions:

• Shaft extended with no vacuum applies.
• Shaft retracted with vacuum applied.

Double-diaphragm motor have three positions:

• Shaft extended with no vacuum applied to either port.
• Shaft halfway retracted with vacuum applied to only one port.
• Shaft fully retracted with vacuum applied to both ports.