Air cleaner assembly
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Air cleaner assembly
I took apart my air cleaner assembly today for some much needed cleaning and disconnected the two hoses on the top I know I know I should have taken a picture rookie mistake but can anyone tell me which hose goes to which nipple? There seems to be some kind of sensor in the lid with two prongs sticking up top and only one prong sticking straight down does anyone know which hose connects to the one with the prong protruding down into the air filter itself. Any info would be greatly appreciated
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
I took apart my air cleaner assembly today for some much needed cleaning and disconnected the two hoses on the top I know I know I should have taken a picture rookie mistake but can anyone tell me which hose goes to which nipple? There seems to be some kind of sensor in the lid with two prongs sticking up top and only one prong sticking straight down does anyone know which hose connects to the one with the prong protruding down into the air filter itself. Any info would be greatly appreciated.
What year, series and engine?
FTE Legend
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From: Angier, NC
I wonder if it makes a difference?
1 side I "think" should go to a vacuum supply and is pulling air from inside the cleaner assy.
Then when the temp is reached that valve closes and the vacuum them goes to that other top nipple to open the snorkel door.
Or something like that.
Also are the 2 top nipples different sizes? I want to say they are and want to say the vacuum supply is the larger of the 2.
Dave ----
1 side I "think" should go to a vacuum supply and is pulling air from inside the cleaner assy.
Then when the temp is reached that valve closes and the vacuum them goes to that other top nipple to open the snorkel door.
Or something like that.
Also are the 2 top nipples different sizes? I want to say they are and want to say the vacuum supply is the larger of the 2.
Dave ----
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From: Houston
Yep, one side has a hose to vacuum that's the same for V8 and I6s. That circular thing is a thermistor a temp sensitive vacuum switch, when its cold enough it allows vacuum to pass through to close the fresh air off and pull air through the emission hose to help warm the engine up.
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Yep, one side has a hose to vacuum that's the same for V8 and I6s. That circular thing is a thermistor a temp sensitive vacuum switch, when its cold enough it allows vacuum to pass through to close the fresh air off and pull air through the emission hose to help warm the engine up.
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From: Houston
It shouldn't matter, its not a check valve its just a on/off switch. But on my 302 the right most nipple when they are facing you is to vacuum while my left most is to the fresh air motor.
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From: Virginia
It does matter which hose goes to which nipple. Like was mentioned already, one hose is vacuum supply, one is output to the heat door in the snorkel.
The piece that the two vacuum lines hook to is a temperature sensor and monitors the temp of the air entering the aircleaner. The sensor will actually modulate the heat door in the snorkel, giving it the ability to be wide open or partially open. As it adjusts the heat door, the vacuum to the heat door and that vacuum output line must be released. The temp sensor is designed to apply vacuum to the output port, and then also release the vacuum to the output port so the heat door can open and shut.
What you will find if you hook the vacuum lines backwards, the door will close and be be slow to open or never open unless it sits there for a long time and the vacuum finally leaks out of the heat door diaphragm and the output line.
The piece that the two vacuum lines hook to is a temperature sensor and monitors the temp of the air entering the aircleaner. The sensor will actually modulate the heat door in the snorkel, giving it the ability to be wide open or partially open. As it adjusts the heat door, the vacuum to the heat door and that vacuum output line must be released. The temp sensor is designed to apply vacuum to the output port, and then also release the vacuum to the output port so the heat door can open and shut.
What you will find if you hook the vacuum lines backwards, the door will close and be be slow to open or never open unless it sits there for a long time and the vacuum finally leaks out of the heat door diaphragm and the output line.
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From: Sheffield, AL
On my 1986 4.9L, the nipple closest to the snorkel connects to the vacuum motor for the snorkel. The other nipple [closest to the firewall] connects to a vacuum port on the intake manifold. 
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thanks for the reply! That is the setup that I had as well, when you have a second can you check if the one closest to the snorkel has the protruding nipple also going down into the air filter? I removed the entire assembly so when I put it back together I'm not sure if I spun it or not
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let me rephrase that, I removed the sensor from the lid and when I went to put it back I realized that the two nipples that come into the lid can go in either orientation, I was just curious if the closest nipple the one leading to the snorkel also had the nipple protruding into the air filter
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From: Sheffield, AL
Last weekend, I drove the truck ~1300 miles to a Ford Truck Show in OK, so have been letting it "rest" while I drive another vehicle, or I would have been able to answer your final question. When I returned home, yesterday after work, it was raining, so I did not check. I hoped someone else would provide the answer. I will try again this evening, but rain is also forecast. Sorry.