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negative pressure in cooling system?
zieg85:
My current daily has this issue I have never seen before. The truck runs fine, heats up normally, has excellent heat, builds up normal pressure and the temp gauge is in the normal range. What I find questionable is after I shut it off and it cools down it sucks the upper radiator hose flat. Would this be a faulty radiator cap. It has the overflow container hooked to the radiator. As I write this I am thinking DUH... just change the cap. Anyone else run into this issue? It is a 95 F-250 with a 7.5L not that it should matter. Thanks in advance!
LILT77:
Sounds like the cap to me. If you want to test that first, take the cap off when this happens (be careful obviously) and see if the hose returns to normal.
zieg85:
--- Quote from: LILT77 on January 08, 2022, 10:17:48 AM ---Sounds like the cap to me. If you want to test that first, take the cap off when this happens (be careful obviously) and see if the hose returns to normal.
--- End quote ---
It does, it holds pressure fine. It has a Motorcraft radiator cap. I guess the vacuum created would normally suck the antifreeze back in the radiator but my cap is sealed so well it sucks the hose flat. Maybe someone put the wrong cap on for a sealed system.
JohnnyPopper:
Probably a wrong or defective cap.
When you have it off, does it have a spring loaded disc in the center, that you can tug off the rubber seal?
bd:
Is the recovery bottle on that truck vented or is it a completely sealed system? Otherwise, I agree. Replace the cap.
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