DPF delete. solenoid going crazy

NRALIFR wrote:
You sure that "solenoid" you're hearing isn't the vacuum pump that's sitting almost on top of the fuse box next to the master cylinder? The pump provides vacuum for the ESOF 4x4 front hubs, and the AC/heater blend doors in the dash. If you have a tiny vacuum leak, the pump will run more often than normal. If it's a big leak, it runs all the time.

Here's a tip for you, you probably have noticed that the degas bottle and the drivers side battery tray are an integrated assembly. Under the battery though, is a vacuum reservoir that's also part of the battery tray/degas bottle. There's a single vacuum line going to that reservoir that is within easy reach of small rodent-like animals when they climb on top of the front drivers wheel well liner. Guess how I know that?

One must have got bored and nibbled a tiny hole in mine several months back. I noticed the pump running more often than normal after my wife complained that the AC on her side would occasionally start blowing HOT while we were driving. I dismissed it as middle-aged women troubles the first 15-20 times. :M She eventually convinced me I better fix it if I wanted to keep my camping buddy. I had a heck of a time finding that leak, and then once I did, I had to drain the coolant, pull the battery, and replace not only the chewed vacuum line but two coolant hoses I had to disturb as well.

Hope that helps.

:):)