RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Cruise Control Vacuum Reservoir: Description and Operation
The vacuum reservoir is a plastic storage tank connected to an engine vacuum source by vacuum lines.
The vacuum reservoir is used to supply the vacuum needed to maintain proper speed control operation when engine vacuum drops, such as in climbing a
grade while driving. A one-way check valve is used in the vacuum line between the reservoir and the vacuum source. This check valve is used to trap
engine vacuum in the reservoir. On certain vehicle applications, this reservoir is shared with the heating/air-conditioning system. The vacuum reservoir
cannot be repaired and must be replaced if faulty.
