Collasped hose normal?
Cargo Master
Joined: Apr 2003
Posts: 2,059
Likes: 426
From: Too close to Houston
Doesn’t sound normal to me. I haven’t looked at my system too close but suspect you have a reservoir cap that’s not opening to prevent vacuum or the hose is kinked that’s supposed to allow coolant back into the system from the reservoir.
Cargo Master
Joined: Feb 2015
Posts: 2,338
Likes: 255
From: Livermore Ca.
I saw this on my 15 and changed the cap on the degas bottle and was fine for a couple days then it went back to sucking it closed. I talked to my Ford diesel guy and he said it was normal.
Cross-Country
Joined: May 2022
Posts: 60
Likes: 14
Normal or common? They dont come like that from the factory...could be a small pressure leak in a coolant fitting or something?
Lead Driver
Joined: Feb 2005
Posts: 7,984
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From: The Great State of Texas
Common... The issue is typically with the cap. As the cooling system goes thru a heat cycle the air expands and pressure is created and as the cooling system cools the air retracts creating a vacuum. Mine did this a few years back and never created a issue. If it bothers you replace the degass bottle cap.
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Cargo Master
Joined: Feb 2020
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Coming from the GM world, a collapsed coolant hose on a duramax is a good sign the head gaskets are blown.
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Cargo Master
Joined: Feb 2010
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From: Delta, CO
On one of A Rod's videos on youtube he commented on the collapsed hose saying something like congrats you have a nicely sealed cooling system. Mine has done this as long as I've had it so I thought it was normal.
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Lead Driver
Joined: Feb 2022
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Good to know. I thought it was odd, but looking at the length of hose and that there is no spring inside to prevent collapse since it is a return hose, I figured I would ask. I had to pop a small hose off the degas to run the harness for the Derringer and it sucked in air restoring the hose. Does sound like the vent in the cap isn't working. I also need to look into the coolant, I thought it is supposed to be yellow coolant, but I think it is green.
FTE Legend
Joined: Mar 2017
Posts: 31,970
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From: Western NY
Good to know. I thought it was odd, but looking at the length of hose and that there is no spring inside to prevent collapse since it is a return hose, I figured I would ask. I had to pop a small hose off the degas to run the harness for the Derringer and it sucked in air restoring the hose. Does sound like the vent in the cap isn't working. I also need to look into the coolant, I thought it is supposed to be yellow coolant, but I think it is green.
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