4.7 HO upper radiator hose supposed to be hard? - JeepForum.com

 
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post #1 of 11 Old 02-05-2016, 11:56 AM Thread Starter
98 platinum
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Wj 4.7 HO upper radiator hose supposed to be hard?

Just purchased a clean 2004 Overland WJ with 174K highway miles. Prior owner was an engineer for Chrysler and owned it since it rolled off the assembly line. I noticed when doing an inspection under the hood that the upper radiator hose is quite hard and hot the lower hose is just lukewarm as well as the radiator cap. Engine does NOT overheat and temp gauge is always at line just before the halfway mark. It is the 4.7 HO engine, is this normal for this engine?

Jeff

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post #2 of 11 Old 02-06-2016, 07:36 AM Thread Starter
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Wj

Can anyone with a regular 4.7 check their upper radiator hose after driving for 15+ mins and see if it is hard and hot? Just trying to get a comparison. Thanks!
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post #3 of 11 Old 02-06-2016, 07:44 AM
ShinyWJ
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Hard hot upper hose after driving- normal.

Lower hose not quite as hot as upper- also normal.

2002 WJ Limited | 4.7 | Quadra-Drive | Inferno Red Pearl | Dark Slate Gray
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post #4 of 11 Old 02-06-2016, 07:45 AM
MadderThanMax
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Can you video it please with you trying to squish it? Not being funny but it lets us see how hard you refer too. I had both sides if the coin.. on another vehicle the head gasket was done and the hose went really soft when on temp and in the Jeep my top hose is firm but not hard.. so you understand why the video - if you chose to show this please look at the clamp ends. There's supposed to be a certain amount of compliance on the hose when at temp..
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post #5 of 11 Old 02-06-2016, 08:21 AM Thread Starter
98 platinum
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I should say it is firm, not rock hard. I will get a video posted later today or tomorrow. Thanks!
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post #6 of 11 Old 02-06-2016, 09:05 AM
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I have two 4.7 WJ's and in my opinion that is perfectly normal.
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post #7 of 11 Old 02-06-2016, 10:36 AM
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^ That's why I asked for the video..
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post #8 of 11 Old 02-06-2016, 04:19 PM
86cj74.2L
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Normal. It's got a 18psi cap.
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post #9 of 11 Old 02-08-2016, 12:52 PM Thread Starter
98 platinum
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Here is a link to the video... https://youtu.be/AG4yeaXcXIg

I am pressing on it pretty good. Just curious as to why the upper hose is so hot, yet the radiator cap is cold and bottom hose is lukewarm. But if it's normal I will drive on! Thanks for the feedback.

Jeff
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post #10 of 11 Old 02-08-2016, 02:21 PM
Double E
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Agreed. I have an HO & non-HO. That's normal for both.

2000 Laredo 4.7L Selec-Trac. 177K miles, Leather, 245 tires, tow package, crappy CD changer, full size spare, roof cross-rails & sunroof.
Changes & fixes: Rear Addco sway bar & greasble bushings, upgraded headlights, upgraded tail lights, new hood struts (replaced 2X), new rear hatchglass struts, new radiator (replaced 3X), new oil pressure sending unit (replaced 4X), 2 new speed sensors, 2 new door lock actuators, new ignition key cylinder, chrome front tow hooks, Mobil 1 Synthetic 5/30, Purolator Pure One oil filter, EBC slotted & dimpled rotors, EBC Greenstuff pads, new front shocks (replaced 3X), new rear shocks (replaced 2X), new IRO steering stabilizer, new timing chain cover, new water pump, thermostat, new thermostat housing, new high pressure power steering hose, Michelin-X radials, new sunroof assembly, new single-piece lug nuts, new exhaust manifold studs & gasket on driver's side, new Durango alternator. Jeepforum.com sticker, Visit cobaltboatsforum.com when you can!
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post #11 of 11 Old 02-09-2016, 10:34 AM
MadderThanMax
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Hi Jeff,

Thanks for that it helps immensely and the good news is that its what everyone else has said, its normal. The bad is that at some point when your flush, the hoses do need replacing at some point as they're shiney and slightly bulged at the jubilee clips.. meaning that they are weak and will benefit from replacement before an overheat happens..and we all know what happens then
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