Radiator Hose Springs - Yes or No ?
If the system pressurizes why would it collapse? Only time i could see where it would collapse is when it cools off if a vacuum is created and suck the hose flat. I always thought a bad radiator cap would cause this.
If you're cruising down the road on a brisk day, engine up to temp, rads doing its job dumping lotsa heat from the coolant, so much that the thermostat is only half open keeping the temp up.
You come up behind a vehicle going slower than you like, so you pull out and jump on the gas. The revs go waayyy up, that high volume pump,(any pump) creates so much suction, but where's the coolant to come from, thermostat is restricting flow, as is the rad.
The result is the pump cavitates, and/or the bottom hose, if soft enuff and without the spring, will collapse.
I was absolutely amazed the first time I saw it. An old Cadillac with an oil sogged lower hose sucked shut right before my eyes, as I reved the engine. Have seen a few since too.
Yes, it was pressurized.
This prob happens more often than known, cuz the collapse doesn't nec last long enuff to overheat.
hope it helps
