Quote:
Originally Posted by davepl
Huh? Putting a 15psi cap on doesn't inflate the system. It's not magic.
Maybe you've got enough pressure when hot to prevent collapse... should I infer from that you think it's OK to collapse when cold?
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Yes, I am saying that as the engine warms up, pressure builds and the radiator hose can't collapse.
When the thermostat is closed (engine cold), there is negligible flow through the radiator - if there is no flow through the radiator, how can the water pump collapse the bottom radiator hose?