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Old 03-31-2012, 10:14 AM
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vacuum problems????

i had to use 4x4 today and noticed that once i twisted the knob to 4hi that the ac quit blowing on vent and moved to dash. i have changed to warn lockouts(don't think it matters, but trying to give all info i can). also, 4lo has never worked on my truck.
any ideas?
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Old 03-31-2012, 10:17 AM
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For the 4lo prob I would check the plug on the transfer case for corrosion . May have a vacuum leak at pump.
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Old 03-31-2012, 12:05 PM
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Let me try and follow, you changed the hubs to "manual?" Warren hubs?
you DO have a vacuum leak if your heater doors go to defrost. That is the default setting.
if those hubs are manual then you can unplug the vac lines and cap them. If they are auto hubs then you likely have a seal that is leaking in the hub.

Yes the 4lo is something different and likely the connector, but possibly the shifting motor.
Don't you have to put the truck in neutral to get it in 4lo? Not sure if this is true or your doing it.
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Old 03-31-2012, 05:26 PM
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yes changed to manual hubs. i didn't do anything to the vacuum lines. do they need to be plugged.
i have been putting it in neutral. i will pull the plug and check it
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Old 03-31-2012, 05:33 PM
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Well they dont have to be unless you develope a leak around a hub seal. At that point they still don't "have" to be plugged but the vac leak would need taken care of.

It is my understanding that most guys who switch to manual hubs, do so because of vac problems and just do away with the system and plug the lines.

This is probably your cheapest route.
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Old 03-31-2012, 06:06 PM
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Yes plug the lines
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