2008 6.4 ac/heat trouble
I have a 2008 f250 with 6.4, when i start the truck ac/heat the fan blows like normal, after 20 miles or so the fan begins to fade away, i can hear it blowing, but no air comes out of any of the vents. vacuum problem? when i start the truck i can hear the pump run, but when the ac/heat quits working if i stop the truck and disconnect a vacuum line the the pump does not come back on. I looked through some of the old threads and couldn't find anything, sorry if this has been addressed before.