Howdy all,

The part shown below is located on the right inner wheel well. When I turn the ignition key to run but don't start the truck, it makes a chattering noise. Mostly the first start of the day. Doesen't do it all of the time. Not sure if it continues when the truck is running. Its a 03 3500 CTD. My cruise is not working. Is this related to the cruise?

Thanks in advance

 

Yes, that's the vacuum pump for the cruise control.

I believe member TCR had to replace his vacuum pump because the CC didn't work.

MikeyB

 

Thanks..anyone Out Know How I Can Troubleshoot This? I Dont Want To Just Buy Parts Until It Works!

 

Does the vaccum pump supply vaccum for anything else besides the CC?

 

Noop, follow your line and check for a vaccum leak between the pump and the CC dashpot.

 

The pump should pull a vacuum on the resorvior tank to lke a 12hg and if no leak it will shut off.it consist of a motor /crankshaft and a diaphram and a switch.If it pulls down and turns off it's good. Look for a leak at the cruise module on the left fender well.

 

THanks guys..I hope to get a chance to check it this weekend

 

I found 3 places where the hard tubing had holes worn through. I used aviation grade heat shrink tubing, layering it as I went along. Rerouted the lines to avoid future issues. Test drove it & It works like a champ!!!

Thanks to all you guys for pointing me in the right direction