There appear to be three vacuum lines connected to the transfer case on my 1997 4WD Blazer. Can anyone tell me where each of the three lines go?

Thanks
Tom

 

One is a vacuum source should come off the back of the manifold or more commonly the line leading the vacuum canister on the driver fire wall.

One is a vent line for the transfer case.

The last one take vacuum up to the actuator located under the battery.

 

Many thanks!