4x4 auto is not working
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4x4 auto is not working
does any one have any idea where i should start looking for the problem of my 4x4 auto not working. If I lock the hubs and turn the 4x4 it works. the auto worked 2 years ago (hehe) long time before i addresss this issue. thx pat
f350 dually 7.3l crew cab 4x6
f350 dually 7.3l crew cab 4x6
Not a liberal...
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From: Cut & Shoot, Texas
When you flip the switch does the A/C default to defrost mode?
If so that is indicative of a vacuum leak somewhere in the system. Could be the connection where the vacuum hoses go into the tops of the knuckles, could be rotten hoses or could be a leak in the hub itself.
If so that is indicative of a vacuum leak somewhere in the system. Could be the connection where the vacuum hoses go into the tops of the knuckles, could be rotten hoses or could be a leak in the hub itself.
Laughing Gas
Joined: Jan 2004
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From: Prince George, BC
Originally Posted by Texas Outlaw
When you flip the switch does the A/C default to defrost mode?
If so that is indicative of a vacuum leak somewhere in the system. Could be the connection where the vacuum hoses go into the tops of the knuckles, could be rotten hoses or could be a leak in the hub itself.
If so that is indicative of a vacuum leak somewhere in the system. Could be the connection where the vacuum hoses go into the tops of the knuckles, could be rotten hoses or could be a leak in the hub itself.
this happened to me last month, 4x4 not working, and when i fliped the switch a/c came out the defrost, my lines were good not cracked, and thanks to all on here that helped, it turned out to be my vaccum solenoid.
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From: Dallas, TX
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4x4 auto
i checked the a/c and 4x4 and all work some slowly but all works. so that system is all vaccum?
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From: Cut & Shoot, Texas
So with the truck running and the A/C on when you switch to 4x4 it doesn't default to defrost but it isn't locking the hubs, correct?
To answer your question, yes, the hubs are pulled in and locked using vacuum. The vacuum system also works the blend door ebwteen A/C and defrost. If you have a leak in the hub system then the blend door will not stay in the A/C position and will default over.
If yours isn't doing that then I would think that you have some sort of problem with the switch. Maybe someone else can chime in.
To answer your question, yes, the hubs are pulled in and locked using vacuum. The vacuum system also works the blend door ebwteen A/C and defrost. If you have a leak in the hub system then the blend door will not stay in the A/C position and will default over.
If yours isn't doing that then I would think that you have some sort of problem with the switch. Maybe someone else can chime in.
Of the next Riffraff East
Joined: Oct 2004
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From: Concord NC
If it is like mine and have a slow leak, the only way mine would default to defrost was when the ac was on max and fan on a higher speed. That would cause it to go to defrost as soon as the 4x4 switch was flipped. Still haven't had a chance to trace out the problem. I just locked the hubs last week at the beach and plugged the vac. lines.
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From: Pittsburgh, PA
I tried seeing the the AC would default to defrost when I flipped the 4x4 switch but nothing happened. The AC still kept blowing ice cold and the truck still won't look the hubs in. My last two F250s auto hubs never worked.. I wish they would but I'm use to them not working by now.
Is there anything else I can check or is it still a possiblity that the vacuum solenoid is not working.. even though my AC doesnt go to the defrost?
Is there anything else I can check or is it still a possiblity that the vacuum solenoid is not working.. even though my AC doesnt go to the defrost?
Of the next Riffraff East
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From: Concord NC
Look under the hood on the passenger side and find the vac pump, canister and solenoid. unplug the line going down to the hubs and see if you have vacuum on them. You can use the finger over the hole test.
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From: Dallas, TX
If you've traced your lines and they are all still intact, than i would just buy a new solenoid and throw it in there to be sure. It seems to be a relatively common problem and the answer usually tends to be the vac solenoid. If it's not, at least you'll have a spare around for when it does go bad. good luck!
Cargo Master
Joined: Aug 2004
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From: Williams Lake B.C.
Originally Posted by Texas Outlaw
So with the truck running and the A/C on when you switch to 4x4 it doesn't default to defrost but it isn't locking the hubs, correct?
To answer your question, yes, the hubs are pulled in and locked using vacuum. The vacuum system also works the blend door ebwteen A/C and defrost. If you have a leak in the hub system then the blend door will not stay in the A/C position and will default over.
If yours isn't doing that then I would think that you have some sort of problem with the switch. Maybe someone else can chime in.
To answer your question, yes, the hubs are pulled in and locked using vacuum. The vacuum system also works the blend door ebwteen A/C and defrost. If you have a leak in the hub system then the blend door will not stay in the A/C position and will default over.
If yours isn't doing that then I would think that you have some sort of problem with the switch. Maybe someone else can chime in.
Leave it running and see if its cold or hot?
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Joined: Jul 2006
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From: Cut & Shoot, Texas
Originally Posted by Vinford
How do you know if it defaults to defrost or not?
Leave it running and see if its cold or hot?
Leave it running and see if its cold or hot?
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