having problems with ac no defrost no air at floor level seems like ac is freezing up pulled out glove box looks like recirc ulating door is working do i have a vachumn problem does anyone know where vachumn pump is 2003 dodge cummins 136000 miles all stock

 

Based on that statement, I'd guess you have a broken mode door.

 

I had issues with my A/C, dealing with different problems. But when I was talking to my friend, who is a diesel mechanic at a dealership, he told me that the broken doors are a fairly common problem.

 

lawdog 79 thank you for info

 

Definately sounds like a broken door. FWIW there is no vacuum pump on an 03. Found that out when my dad's power steering pump went out and he lost his brakes. Just thought you might want to know.

 

thank you bpm for info

 

Probably the door but for future reference the "03" has a vacuum pump on the passenger fender well used for cruise control.

 

thanks everyone for the info

 

Does the floor/defrost stuff work fine at first, then quit after an hour or so running on AC in really hot temps?

In that case, the evaporator may be freezing up. Moving the temp sensor may help, and you would also want to make sure the drain is clear.


If on the other hand you don't have defrost or air to the floor when put in those modes right off the bat, then you likely have broken doors inside the housing.

THis thread may be helpful.

https://www.dieseltruckresource.com/....html?t=210483

 

Broken door or door motor; had the same issues a few months ago.