esof troubleshooting
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esof troubleshooting
I have a 2005 f250 and have the defrost only option coming out of my vents no matter what setting my air is on which makes me think vacuum leak. Funny thing is my 4x4 works fine and when i plug the vacuum lines to the esof solenoid it doesnt change anything. Still defrost only. I even replaced the esof solenoid to no avail. Ive read articles that troubleshoot the procedures after plugging the vacuum lines making the ac switch through vents but nothin that addresses my situation. Any help?
Lead Driver
Joined: Sep 2007
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From: Scio, OR
Is your engine gas (generates it's own vacuum), or diesel (has a vacuum pump).
If it's diesel, pull the vacuum line off of the pump and see if it runs (with the key on). If it doesn't, the pump itself has failed. If it runs, put your finger over the nipple and see if it stops. If it does, the pump is working OK.
Then start working your way down the lines one junction at a time. If the pump pulls up a vacuum and stops, you have no leak between the junction or connector you are testing. If it continues to run, you do. You can isolate and test each line and joint this way if you systematically work your way out from the pump.
If it's diesel, pull the vacuum line off of the pump and see if it runs (with the key on). If it doesn't, the pump itself has failed. If it runs, put your finger over the nipple and see if it stops. If it does, the pump is working OK.
Then start working your way down the lines one junction at a time. If the pump pulls up a vacuum and stops, you have no leak between the junction or connector you are testing. If it continues to run, you do. You can isolate and test each line and joint this way if you systematically work your way out from the pump.
Lead Driver
Joined: Sep 2007
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From: Scio, OR
So you're saying a gas engine doesn't use existing engine vacuum to operate vacuum operated accessories? I have never heard that. I don't know why they'd put an electric vacuum pump in when they already should have more than enough vacuum available.
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Thanks everybody I really appreciate your help. it is a diesel. My pump does nothing key on or running. Sounds like we pinned it down.
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Lead Driver
Joined: Sep 2007
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From: Scio, OR
Your vacuum pump is probably bad. But before you go about replacing it I'd disconnect the power connector and test for voltage. No point replacing a pump if it's a fuse or something instead.
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Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
Yes it's on the fenderwell. It's probably more efficient than engine vacuum and doesn't need the engine running.
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12.14V DC. Makes me wonder why it failed. I read that a leak that keeps the motor running continuously can burn it out. Maybe just old. ill have to troubleshoot it when I get it. Rockauto seemed to have the best prices.
Tuned
Joined: Oct 2002
Posts: 466
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From: South Central KENTUCKY
If the ESOF has its own vac pump, why do people lose blend door vacuum when esof leaks? just curious.
While I am here, I will explain my issue, maybe someone can guide me in another direction.
My hubs will not auto lock. I DO NOT want to replace them with warn or any other manual hubs, i like ESOF and I have the option to do it manual anyhow.
SO my transfer case is shifting fine, everything works if i lock the hubs in.
I took the hubs apart per Guzzle's guidelines, and replaced all the orings cleaned and greased.
still the hubs will not auto lock. I DO NOT LOSE vaccum when i try to lock in. Light come on transfer shifts, put i have to lock hubs in by hand.
any ideas.
don't have the truck today, letting the guys replace the ball joints right now and rotate and balance the tires.
Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
On a diesel truck, the electric vacuum pump provides vacuum for the front hubs and the HVAC controls. Apparently the same is true for at least some if not all gas trucks.
The best way to test vacuum problems is with a hand vaccum pump and gauge. In your case, I would disconnect a vacuum line from one of the hubs, connect it to the gauge, switch to 4WD (with the key on so the pump will run) and see if vacuum is applied and how much, etc.
You can use the hand pump to test for leaks. Isolate a hub, or a section of vacuum line and pull a vacuum on it and see if it holds. Isolate and test each section of vacuum line and you will isolate a leak.
In your case, I suspect that your vacuum solenoid has failed and is just not sending the vacuum pump like it should. Since it appears you have and are holding vacuum in the system.
The best way to test vacuum problems is with a hand vaccum pump and gauge. In your case, I would disconnect a vacuum line from one of the hubs, connect it to the gauge, switch to 4WD (with the key on so the pump will run) and see if vacuum is applied and how much, etc.
You can use the hand pump to test for leaks. Isolate a hub, or a section of vacuum line and pull a vacuum on it and see if it holds. Isolate and test each section of vacuum line and you will isolate a leak.
In your case, I suspect that your vacuum solenoid has failed and is just not sending the vacuum pump like it should. Since it appears you have and are holding vacuum in the system.