Compression Ignition Addict
Join Date: Sep 2012
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If your vacuum pump is running constantly, it's probably a leaky or disconnected vacuum line. If you turn your key to the on position but don't start the truck, you'll hear the pump run. It should stop after 30 seconds to a minute or so. I don't really know how long exactly, but it will stop. If it doesn't, you've got a leak somewhere. The vacuum system in these trucks is fairly limited, meaning it doesn't run very many things, so it shouldn't be too tough to track the leak down.
If you don't have the pump plugged in, certain things won't work. These might be things you'll miss, like air conditioning and ESOF 4x4. Then again, that's all the vacuum system runs, so maybe you won't miss them. However, I like AC and 4x4, so I'd be inclined to fix the leak.
For dnaber, a drip coming from the passenger side could have been condensation on the AC compressor. The amount of water that builds up on that thing when it's humid out surprises a lot of people the first time they see it (including me).