madmanmarty

As stated,the springs are not necessary at all.

toasterknight

You are wasting money but if it makes you feel better.

warthog

Ask me how I know they are needed. I've watched them collapse

toasterknight

Then there is something else wrong with your cooling system. That hose is at 16 psi when hot and it would take more vacuum to collapse the hose.

CCKen

The coolant flow through the lower hose is greater than the upper hose.


The higher velocity coolant passing through the lower hose will drop the pressure in the hose a bit (Bernoulli's Principle) and with the old style hose may have a tendency to 'pull' the hose closed. The spring helped prevent this on the older style hoses.


I experienced this when working on an aircraft. The engine oil pressure would drop when the throttle was advanced (increase in engine RPM). Found that the inner lining of the oil feed hose from the oil tank to the inlet of the oil pump was dislodged from the hose and when the velocity of the oil passing through the hose increased, it caused the inner lining to collapse - pinching off the oil flow.

TFitzPat87

Kinda reviving a couple month old thread, but what is the official verdict? Needed or not? It honestly makes sense both ways.

Waynerd

Not neccessary but maybe a good failsafe. I've replaced on multiple vehicles through the years and never purchased an aftermarket hose that had one in. No matter how credible the parson giving u the answer is, there will always be an opposing side. Do u think if a chrysler engineer said it wasn't needed everyone would agree? Not likely. Not haveing the spring in there is nothing to lose sleep over.

DFlintstone

Somewhere, someone, once posted they use vacuum at the factory to fill the system quickly, hence the spring. At temp, with the T-stat open, one would expect pressure in the system.

Post 90, the check valve in the rad cap should let contraction from cooling draw coolant in from the coolant overflow reservoir. (very little vacuum then)

madmanmarty

Not needed.

abodyjoe

don't really need that spring these days.. but itf its something that make you feel better you can buy this one.. http://www.cjponyparts.com/lower-rad...5bwaAt3D8P8HAQ




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jd95XJ

Did you find a spring? If so where did you get it and how hard was it to put in?

jeepin89701

Thanks So Much for the link, post is older but pertains to my issue. High flow water pump and 3 core radiator to cool 4.6 Stroker the molded lower hoses start to collapse after a few months.