Vacuum pump

Ok, so the vacuum pump that is attached above the fuse box under the hood(6.4) is making lots of noise. Rattling loudly. Is it a sign it's failing? And what exactly is it for? I'm about 1000km from home and would prefer to wait until home but I'm headed through the Rockies and don't want to have fail and then there be a bigger problem


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Vac pump is for your 4wd and hvac

^^ what he said. Hoses get brittle and break easily over time, could be causing a leak and making it run more often.

Ok. The the heater and a/c work ok. But it won't engage 4x4 in auto mode. Only if I manually lock the hubs


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My vacuum pump went out about a month ago. Same thing, for 4wd I had to manually lock the hubs. My truck was at the dealer for a couple other things so I just had them replace it. It was about $250, so I'm sure if you do it yourself it would probably be 1/4 the cost.

I'd trace all of the vacuum lines from the pump to the solenoid up on the front on the shroud and down to the hubs. Bet you have a cracked line/broken plastic fitting/ or disconnected line.

turn the key to the on position, The Vacuum pump should pull a vacuum & then shut off. If it runs continuously look for a leak. Starting at the pump pull the hose/tubing & plug the port on the pump, if it pulls a vacuum & shuts off, then the pump is probably ok, work your way thru the tubing disconnecting & plugging the tube running back towards the pump to narrow down where the leak is. If you get down to where the tubing leads into the hubs ,then the vacuum seals in the hubs are probably NFG.

Haha NFG. We had a little hand pump that we tested my lines/hubs with. Probably costs like 10 bucks at an auto parts store

I found the best way to look for leak was to start at the pump and work your way away from it pulling lines and covering with your finger so that if it pulls a vacuum and shuts off=good, and if not then you know the problem is between the last point that checked out and the one that didnt

Thanks for all the advise. I'm off for the next few days. Hopefully I can get to it, as long as the honey-do-list isn't to long


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Are there alternative vac lines that some could use? Like the high temp rubber ones?


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Canadian6.4 said:

Are there alternative vac lines that some could use? Like the high temp rubber ones?


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Click to expand...

This... Mine will break the minute you touch them. BS!


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I'm sure you could use.anything that'll fit on the ports.... as long as it keeps a seal. Its probably 1/8 npt? Go all out with some stainless braided vac lines lol

Lol


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