Thanks for the input, Just some additional info. I have noticed that it only happens when it is really hot and I turn the ac off then back on or if I turn the truck off and then back on quickly. The reason that I was looking at the hubs is that when this happens the mpg on the computer fall quick, like will go from 14 to 12 in minutes then come back fairly quickly when everything straightens out.
I have visually checked the lines and they look ok. I put vacuum on the only hose that I have coming from the pump and it holds vacuum.
The pump acts squirly though. I pulled the line off once and the pump kicked on for like one second and shut down. It hasn't repeated that trick again. I took the electric plug off to inspect for a worn wire and the pump wouldn't stop when I plugged it back in until I shut the truck down. When I started it up, nothing from the pump but the ac was working right.
My Grey line looks like it is out of place I have reattached it but it looks like it is improperly routed. Don't know if this has anything to do with it but??
I don't know the proper troubleshooting steps to test the pump. I have a service manual coming but would like to get a jump on it if possible. Anybody know the steps?