The Vacuum Pump

[gpintler]

I am working on my 04
The Vacuum Pump is located on the right side [sitting in the drivers seat]of the engine compartment, close to the fire wall. A small line goes to a T center of the fire wall, then continues to something under the battery box.

1] What is connected to vacuum in the center ?
2] What is under the battery box that needs vacuum ?

possible answer to [1] -- a vacuum canister
possible answer to [2] -- Cruise Control can

3] What else is the Vacuum pump used for ?

Thank you for your help.

 

[Ozymandias]

All correct.

To 3] Nothing, 1&2 is the whole system.

 

[CharlesinGA]

Electric operated? what is it there for? The Brakes are hydroboost, the HVAC damper actuators are electric. Is this something added to the truck? Aftermarket installation for something?

Charles

 

[Ozymandias]

Electric operated? what is it there for? The Brakes are hydroboost, the HVAC damper actuators are electric. Is this something added to the truck? Aftermarket installation for something?

Charles

Only for the cruise control servo.
A leftover from the mechanical aera, it disappeared with the 05 MY.

 

[CharlesinGA]

Manufacturers will go to great lengths to use up existing stocks of parts, even if it means adding other un-necessary parts to accomplish something. Its the old "hey, we have 10,000 of these cruise control actuators left, what do we do with them" and the response, being, "we will buy electric vacuum pumps to operate them", rather than trashing the remaining actuators and going all electronic.

Ford did this on the little Bronco II in 1989 when they found themselves with a huge batch of Mitsubishi 5 speeds (the ones with a stamped metal top cover..... on the bottom) already mated to a transfer case. How do you use them up? You install them in 4x2 vehicles and put a blanking plate on the front driveshaft output and a bracket to hold the xfer case shift linkage in high range rwd. I knew someone who had one and the local Ford dealer confirmed that it was legit factory install.

My '03 has an accelerator cable from the pedal to the pedal position sensor on the bottom of the LH battery box. Gotta use up those VP44 accelerator cables from the year before somehow. Then we'll consider putting the PPS on the...... pedal.

Charles

 

[Ozymandias]

Problem here was we still had a mechanical TV governor for the transmission, that's why that workaround was actually necessary.
It went away asap in 05 with the change to an electronically controlled governor.
Dodge likes to stick with outdated but working solutions, see the 6 speed transmission in our 2024 trucks, lagging 10 years behind the competitors.

It works, why change it...
Good and bad at the same time.