Alright guys. its getn colder and everything out nd things r not working rite for the winter. I read some other forums that were posted. It sounds like my vacuum pump. My heater is on defrost and my fourwheel drive is not engaging. The question is I heard hissing sound coming from around the vacuum pump area. Obviously it is working o it wouldnt b hissing right? Is there a seal that goes around the pump? How hard is it to change if it is bad? And how much? Thanks for your help

 

you can get the rebuild kit from cummins for about $30 dollars. not to bad to do just take your time

 

It appears to me that you have a vacuum leak. I recommend you give Mr. Pete Gould a call. His # is on this website: www.fixinrams.com

I am a satisfied customer with his professionalism, and his service.

 

When I had my 00 3500, the hose from the vacuum pump would come apart from the Y on the firewall, Drivers side. That killed the Hvac controls for me.

Dave