Air filter indicator/Vac Pump? problem - Ford Powerstroke Diesel Forum
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Old 08-11-2007, 09:57 AM
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Air filter indicator/Vac Pump? problem

I have an 03 F350 6L. Yesterday the air filter light came on and it will not go out. The air filter is clean and there is no obvious wires off the sensor. There is also what seems to be a vacuum pump on the inside right fender that runs continuously and only shuts down when you turn the ignition key off.(is that normal?)
Anybody have any ideas of what to look for??? Thanks
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Old 08-11-2007, 10:19 AM
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the filter is clean but you have a light? have you checked the filter minder on the airbox? does it need to be reset? if so then you may also need a new filter. no clue on the vacuum pump running continuously. sorry.
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Old 08-11-2007, 10:32 AM
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Filter is clean,(its an AEM washable filter) the plastic air filter resettable indicator is long gone and the hole is plugged. The indicator light in the dash is on for the air filter.
Also none of the heater/AC controls will switch from the defrost setting.
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Old 08-11-2007, 11:12 AM
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Sounds like the vac lines have gotten brittle and may have a leak. The vac pump is trying to move the setting for your ac controls, but can't because of the leak is my guess. But I also coule be wrong. The vac lines get brittle with time. Had the same problem on my F-150 last yearand had a brittle vac line that had a crack in it and therefore had no vacuum
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Old 08-11-2007, 11:27 AM
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Got it fixed. 4x4 vac solenoid stuck open and vac line broke at the wheel.
Air filter indicator now OK, someone put a jumper on the sensor minder plug and it fell off.
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