Okay, first a bit of history. 2006 F350 DRW. Last fall/winter I had a squirrel problem...they made a nest on top of the passenger side battery. Little bastards managed to chew thru the ac wiring, both vacuum lines that run to the pump and a few other wires. I found it, cleaned everything out and repaired all. Things were fine until a few months ago when I discovered the 4x4 wouldn't shift on the fly. Turned out they got in there again and got the vacuum line AGAIN! I got it fixed and all was good. Well yet another came back and got to the vacuum lines again (same ones). I repaired and all was good
Now, here's the issue. I went to work the other day and everything was good. Jumped back in the truck and the climate control defaulted to defrost and would not change. While I was looking for another vacuum leak I discovered that the vacuum pump would not shut off. A few days go by and now everything works fine as I have both 4x4 and full climate control. But the pump will run for 2 minutes, cycle off and pulse, then run continuously again, all while everything is working fine. I assumed that they were only supposed to run to build vacuum into the canister and then shut off, only to cycle on /off as needed. What is the proper procedure for these things?? Help as I am at my wits end with this issue.
PS....still working with trying to get rid of the squirrels!!!