I have a 2017 Kenworth T680. If the trailer is empty its no problem but when I am loaded the air won't build. It takes long time used to be two minutes driving before it will build, now it longer even 10-20 minutes. I don't hear any air leaks, but it burns a lot of fuel.
Also the fan won't shut off, but again only when I'm loaded. If I'm hauling empty trailer its fine.
Suspension wont build air when under the load
Discussion in 'Kenworth Forum' started by Mokhtar, Dec 7, 2023.
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Might be the pressure protection valve stuck partially closed.
I don’t know which one it has. You can google pressure protection valve and get a idea of what you’re looking for.
@Goodysnap -
Sounds like you're not building air pressure. That's why your fan stays on too. I'd bet you have a major leak somewhere under a load.
Big air leaks make little noiseJB7 Thanks this. -
You have an air leak someplace, a valve stuck, a bad air assisted fan clutch would be my most likely guess by your description.
Unplug the wires for it, this should make it not ask for air. If its leaking that will make your bags work normal until you plug it back in. -
Gremlins in the machine,,,, okay, you got at least 3 things going on here. I don't think they are related. Could be an air leak, but you'd hear something. Ride height valves do go south, fan running while loaded sounds like a plugged radiator, and they all use a lot of fuel. If you aren't building air, could the brakes be dragging?
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blairandgretchen Thanks this.
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