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Unread 07-25-2010, 11:57 AM   #1
mcoh1030
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Spring Inside Lower Radiator Hose

Why is a spring a good idea to have in the lower radiator hose?

How can I tell if my lower hose, which does not have a spring is causing problems with my 4.0 running hot?

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Unread 07-25-2010, 11:59 AM   #2
Dryseals
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Quote:
Originally Posted by mcoh1030 View Post
Why is a spring a good idea to have in the lower radiator hose?

How can I tell if my lower hose, which does not have a spring is causing problems with my 4.0 running hot?
Lower radiator hose is under a suction. A hot hose become pliable and can collapse. You need the spring/
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Unread 07-25-2010, 12:33 PM   #3
ElementX
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yeah you need the spring and unfortunately that lower hose with spring is a dealer only item. If you are missing it, it will definitely cause cooling issues.
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Unread 07-26-2010, 05:51 AM   #4
mcoh1030
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Lower Hose Radiator Hose without Spring

OK, my lower rad hose doesn't have the spring. But when I go under the Jeep when it's running at operating temp, I don't see the lower hose collapsing.

Is there anyway to know if it is??? I have the original lower hose if there is no way of telling weather the hose is collapsing, I guess I should just replace it with the original spring and see if I get better cooling results.

I would think that if it were collapsing during operation, I would see it fold in on itself.
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Unread 07-26-2010, 06:29 AM   #5
ZekeJeep
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regardless of if you see it collapsing or not, your lower hose is missing a required element to cool properly and your vehicle is running hot. Seems like a simple cause and effect issue. You need to replace the hose, then ask more questions if that doesnt work.
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Unread 07-26-2010, 07:05 AM   #6
Unlimited04
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fan clutch working? fluid flush?
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Unread 07-26-2010, 07:10 AM   #7
Dryseals
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Quote:
Originally Posted by mcoh1030 View Post
OK, my lower rad hose doesn't have the spring. But when I go under the Jeep when it's running at operating temp, I don't see the lower hose collapsing.

Is there anyway to know if it is??? I have the original lower hose if there is no way of telling weather the hose is collapsing, I guess I should just replace it with the original spring and see if I get better cooling results.

I would think that if it were collapsing during operation, I would see it fold in on itself.
Suction pressure is a fundamental of pump speed, the faster the pump spins, the more suction it will create. If your bold enough, you can hang on at 70 MPH and see what it's doing. I'm not, so I keep the spring in there.
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Unread 07-26-2010, 07:22 AM   #8
sthomp
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I recently replaced my lower radiator hose with an aftermarket hose. I did not replace the spring because it was practically rusted in pieces. The guy at the parts store claimed that the new hose was different and did not need a spring but I take everything those parts stores say with a grain of salt... Anyway, I have had it on there for a few months without the spring and havent seen any cooling issues, crawling around in the high 90s or cruising at 70mph. I have been keeping an eye on the temp gauge and havent noticed anything strange, but I may put a spring in eventually just to be safe.
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Unread 07-26-2010, 09:20 AM   #9
mcoh1030
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I just crawled out from under the Jeep. I was hangin out at over 70mph, when I looked in the mirror I saw Robert Deniro/Max Cady, (CAPE FEAR).

What I'd like to know is:

Is it possible that without the hose, the spring in the hose, the engine would run 20-30 degrees hotter than normal?
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Unread 07-26-2010, 09:27 AM   #10
RowJ
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Quote:
Originally Posted by sthomp View Post
... The guy at the parts store claimed that the new hose was different and did not need a spring .....I have had it on there for a few months without the spring and havent seen any cooling issues....
I was told same thing...Some new hoses (Gates Rubber Co maybe) won't colapse!
After closely inspecting the new hose.... I have my doubts.... but what do I really know?
To sleep better at night - I pulled old spring from torn hose and inserted it in new hose!
Why not!
Quote:
Originally Posted by mcoh1030 View Post
....Is it possible that without the spring in the hose, the engine would run 20-30 degrees hotter than normal?
Yes if it colapses! If not I think it might run cooler.... due to better flow and no preheated metal in the fluid stream.
But in real world I can't see a significant difference. JMO
Still searching for cause of your over heating problem? Mine was head gasket leak.


RJ

Last edited by RowJ; 07-26-2010 at 09:39 AM..
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Unread 07-26-2010, 10:58 AM   #11
Neil F.
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Quote:
Originally Posted by mcoh1030 View Post
OK, my lower rad hose doesn't have the spring. But when I go under the Jeep when it's running at operating temp, I don't see the lower hose collapsing.

Is there anyway to know if it is??? I have the original lower hose if there is no way of telling weather the hose is collapsing, I guess I should just replace it with the original spring and see if I get better cooling results.

I would think that if it were collapsing during operation, I would see it fold in on itself.

All you need to do is move the throttle linkage by hand at the throttlebody and watch the hose.
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Unread 07-26-2010, 11:29 AM   #12
mcoh1030
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When you first developed the head gasket leak, was your engine running hot???

Did you have other symptoms???
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Unread 07-26-2010, 11:48 AM   #13
RowJ
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Quote:
Originally Posted by mcoh1030 View Post
When you first developed the head gasket leak, was your engine running hot??? Did you have other symptoms???
Yes... hot with exhaust gas getting into coolant!
(we discussed this on my original thread)

RJ
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