Is the vacuum pump only for cruise control?

[GOT-Torque]

On the 03/04 dodges, is the vacuum pump only used for cruise control operation?



Thanks

 

[Spooled-up]

The only other thing I know it's used for is some applications use it as part of the exhaust brake install. Someone correct me if I'm wrong.

 

[CMullen]

How about hvac vent operation?

 

[Hercules130]

there is no vacuum pump. if you had the jake brake then there is one, but the HVAC uses electric actuators i beleive.

 

[artie]

The only other thing I know it's used for is some applications use it as part of the exhaust brake install. Someone correct me if I'm wrong.

The small eletric pump cannot create enough vacuum to operate much of anything else besides the cruise controll in fact it seems that it does not that much of a problem and there is not enough vaccum to operate the cruise control. I have had the vacuum pump replaced under warrranty once already because it stopped making enough vaccuum when out on the road going up hills needed a lot to keep up.



As far as the HVAC vents they are operated by small electric motors these days.

 

[GOT-Torque]

Thanks a bunch, thats what I needed to know.



The wealth of knowledge on this site is priceless!

 

[klenger]

I thought the 3rd gens were all fly by wire.

 

[jwduke]

Good point, Ken. You wouldn't need vacuum to run cruise, with a drive by wire system.

 

[artie]

In the 03-04 automatic transmission system there was still a cable from the part of the TPS unit to the transmission for control of the kink-down type function and the cruise control was done with a vacuum operated servo with a cable to the TPS unit like to old days. It was because of this cable to TPS connection that adding the programming in the 04 ECM that controlled both the engine and automatic transmission to use the servo unit to run up the idle speed using the cruise control system already in place.