4x4 and heating problem
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4x4 and heating problem
Had a problem with the 4x4 in the driving in snow sucks thread. Now im not so sure its even in 4 wheel drive. I have the ESOF and it says its in but Im not so sure. How do I tell for sure?
I also only have defrosters. I have read that these are connected to a vacuum leak. True?
thanks.
I also only have defrosters. I have read that these are connected to a vacuum leak. True?
thanks.
Of the next Riffraff East
Joined: Oct 2004
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From: Concord NC
Very true. You have a leak in your vacuum system some where. The vacuum is what controls the blend door and what operates the auto hubs. If your defroster works ok until you switch the ESOF, then the leak is in the lines below the 4x4 solonoid, or a bad seal in one of the hubs. If your defroster is alway blowing, no matter where your ESOF is, then you leak is at you leak is between you vac pump and anywhere under you dash.
Of the next Riffraff East
Joined: Oct 2004
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From: Concord NC
Start at the vacuum pump, then the canister, then just start tracing the lines back thru the fire wall and under the dash. There are several plastic connections that tend to break or come unplug. Pump will run with switch on engine off. First thing you need to check is make sure the pump is running. Should hear it, mounted on passenger side fender unless they moved it after 03.
Senior User
Joined: Jul 2005
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From: Lake Worth, Fla.
I had that problem on my 2000 at 350. Everything went to defrost. There is a nipple on the hub that a vacuum line connects to and it's very possible that nipple has corroded and creating a vacuum leak. Try that
Of the next Riffraff East
Joined: Oct 2004
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From: Concord NC
Originally Posted by G BOBKA
I had that problem on my 2000 at 350. Everything went to defrost. There is a nipple on the hub that a vacuum line connects to and it's very possible that nipple has corroded and creating a vacuum leak. Try that
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It has to be that. I have the auto/lock hubs and if I lock them it goes into 4 wheel drive. Where is this nipple located and how do I get to it?
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From: Long Island USA
The vacuum solenoid for the ESOF also has been known to leak vacuum ... when it's off, it vents the hubs to the air. Somehow it gets dirt in it or something, and it leaks vacuum ...
Just keep that in mind when checking for leaks - it's more likely you have a broken hose somewhere. Better to try the free things first
Just keep that in mind when checking for leaks - it's more likely you have a broken hose somewhere. Better to try the free things first
Of the next Riffraff East
Joined: Oct 2004
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From: Concord NC
If I read this correctly, his problems exist when not in four wheel drive, this would point to a problem with his in cab air system. This would be from the solenoid to the canister back to the pump then to the cabin air system. Start by undoing the line at the soleniod and plugging it. If problem still exist, the ESOF system is not the problem, or at least not all the problem. I'm betting it one of the cheap plastic tees under the dash. Good news is, most of the time you can hear and find them easy.
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Originally Posted by zx250
If I read this correctly, his problems exist when not in four wheel drive, this would point to a problem with his in cab air system. This would be from the solenoid to the canister back to the pump then to the cabin air system. Start by undoing the line at the soleniod and plugging it. If problem still exist, the ESOF system is not the problem, or at least not all the problem. I'm betting it one of the cheap plastic tees under the dash. Good news is, most of the time you can hear and find them easy.
Mountain Pass
Joined: Jun 2005
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From: Arvada, Colorado
Is this a diesel or gasser? I only know the diesel side. Not sure if the gassers have a vacuum pump or comes off the manifold.
My vacuum pump died and I had the same symptoms. Dealer wanted about $145 for new one. Couldn't find a used one localy. Ended up buying a used one off of Ebay that was out of a Volvo. Paid less than $20 including shipping and still working after 2 years. Had to cut the connector off and crimp a couple of slide terminals on to make it work though.
.
My vacuum pump died and I had the same symptoms. Dealer wanted about $145 for new one. Couldn't find a used one localy. Ended up buying a used one off of Ebay that was out of a Volvo. Paid less than $20 including shipping and still working after 2 years. Had to cut the connector off and crimp a couple of slide terminals on to make it work though.
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Last edited by firedewd; Dec 15, 2007 at 11:23 PM.
