2003 Auto 3500 Cruise Out!

[TDuckworth]

The cruise light will light up on the dash, but one day it was working and the next day nothing on the set, acc or resume would work. I cane not find a blown fuse or anything that is labled a fuse for it. Any ideas?

 

[JARichard]

It happened to me on my 03 2500. I would check the vacuum hoses right around the fuel filter area. On of mine was half eaten through from rubbing on each other.

 

[BDuffy]

could be a bad vacume pump,needs to pull10"of vac. its electric and by the right side by the trans. computor

 

[TDuckworth]

Yes, but should the pump be running all the time? It is running when the motor is off but the key is on and it seems to be running all the time that the motor is running and in park.

 

[artie]

That is not correct the pump should run and build up vacuum and cycle off when sitting in park. Mine had a problem that after I got going it could not generate enough to keep the srvo happy and would totally drop out of cruise. Pump was replace under warranty and all has been ok since.

 

[TDuckworth]

Thanks for all of your help! This is the best help I have ever had with any truck problem, heck the dodge sealer dosen't help this much!

 

[JARichard]

Yes, but should the pump be running all the time? It is running when the motor is off but the key is on and it seems to be running all the time that the motor is running and in park.

Man, I would really check those vacuum hoses. I ended up cutting the bad section and putting a thick walled rubber hose over the good sections to splice them.



Have you checked the hoses?

 

[TDuckworth]

Found the problem

Where dose the hose that goes up in to the dash go? I have icolated the other and found the the vaccum leak is under the dash, but what dose this hose run? With the pump disconnected the only thing that doesn't work it the Cruse.

 

[rbattelle]

I believe the pump only runs the cruise - nothing else. I'm not sure why there's a hose running to the dash; according to the service manual there shouldn't be one. The cruise servo is located under the driver-side battery, so there should be a line that runs under there.



On most of the gas engines, a vacuum reservoir is used. It's located under the cowl grille (the black plastic thing from which the wipers emerge). Maybe you actually have a reservoir under there?



Here's a few diagrams that might help:





Ryan

 

[TDuckworth]

Where can I go to get the manual like you have take this Exploded Veiw from?

 

[artie]

The reservior is also used on the diesel system as well.

 

[rbattelle]

The reservior is also used on the diesel system as well.

Now that is very interesting. My manual specifically states there is NO reservoir on the diesel trucks. Obviously a mistake in the manual.



Link to order service manuals.



Ryan

 

[TCDiesel]

No Reservoir , Only vacuum lines, servo, cable.

 

[NavyDood]

Where can I go to get the manual like you have take this Exploded Veiw from?

www.Hemitruckclub.com Look on the left hand side.