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Old 02-20-2012, 06:15 PM
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4x4 not working..?

Well I was out hunting this weekend and went to use my four wheel drive and it did not work. I turned the switch to 4 high and the front wheels did not engage. I had to LOCK the front hubs in instead of having them in AUTO to get the four wheel drive to work. Is there a vacuum that engages the hubs in AUTO, where do I need to start checking? Thank you.

Will
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Old 02-20-2012, 06:26 PM
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On the passenger side of the engine bay there is a vacuum solenoid. Turn your key to on and make sure the pump runs first. Then use a vacuum gauge and connect it after the solenoid to see if the solenoid works correctly when switching to 4x4. You can also check the lines to the hubs with a vacuum pump to see if one of the seals in the hubs are leaking. The vacuum solenoid tuned out to be the culprit on my truck.
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Old 02-20-2012, 06:31 PM
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on the passenger fender wheel well? What else does the vacuum solenoid operate? Thanks,

Will
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Old 02-20-2012, 10:43 PM
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would like to know the answer to that as well!! Coach
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Old 02-21-2012, 05:54 AM
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Doesnt that work the AC valve on the radiator hose too?
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Old 02-21-2012, 06:10 AM
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It controls your defroster or something like that if I remember right. If you switch to 4x4 and the only thing that blows air out is the defroster, you have a vacuum issue. Also can happen all the time if you had a leak before the solenoid I guess.

Last edited by F250SixOH; 02-21-2012 at 06:14 AM.
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Old 02-21-2012, 08:21 AM
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If your heater will only blow on defrost then you have a vacuum leak. Most of the time it's on the tubing going to the hubs. There are stainless steel braided ones you can buy but I don't recall who sells them. I just remember its a popular supplier.
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