shouldn't upper radiator hose get hot? - JeepForum.com
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Unread 01-17-2008, 08:40 AM   #1
luckyjeep
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shouldn't upper radiator hose get hot?

This is my 1st jeep so maybe not? But over new years i found a cut in the upper hose, near the crappy spring clamp (need to get a petition to get rid of those things) and installed a new hose and the right clamps.

I didnt fill anything up at the time and as today was the 1st time driving it since then, the low coolant warning came up. So i got what little A/F i had left in the garage and also put some water in to bring it up to the add line. I want to run it a bit then let it cool before adding more.

the one thing that i noticed was that neither the upper hose nor the radiator cap was hot even after 10 min of idling today.

is that normal or will it change when i do fill it up more? It's just i expected the hose to be warm at least but it was ice cold. Now that i'm typing this i realize i should have felt under the hose but i didnt, just the top.

I've had full and very hot heat since i got the jeep a few months ago so nothing could be clogged right?

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Unread 01-17-2008, 09:48 AM   #2
MSU.WJ
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Yes the upper radiator hose should be hot. Make sure you bled all of the air out of the system correctly and that there is coolant visible with the radiator cap off (obviously, don't take the cap off with the engine hot).
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Unread 01-17-2008, 09:48 AM   #3
ratmonkey
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if it lost a lot of fluid you need to put it directly into the radiator, if just to gauge how much you need. since it's not getting hot you have probably lost a considerable amount.

i wouldn't drive it anywhere with coolant so low the upper rad hose isn't getting hot.
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Unread 01-17-2008, 11:13 AM   #4
tsconver
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Quote:
Originally Posted by ratmonkey
if it lost a lot of fluid you need to put it directly into the radiator, if just to gauge how much you need. since it's not getting hot you have probably lost a considerable amount.

i wouldn't drive it anywhere with coolant so low the upper rad hose isn't getting hot.
could also be a stuck thermostat.
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Unread 01-17-2008, 11:22 AM   #5
Sporer65
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Let it get up to running temperature and then check it. The needle shut be straight up.
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Unread 01-17-2008, 11:40 AM   #6
luckyjeep
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what are the symptoms of a stuck thermostat? wouldnt it over heat then? I drove 80 miles today and from the moment i left the driveway (idled for 10 minutes) it was 210 and fine all the way to my site. I also know at lunch nothing under the jeep leaking thankfully (hose is holding) but didnt pop the hood to check the hoses.

sounds like need to go home, cool down, pop the rad. cap and fill. With my old car that had no reservoir tank i remember just watching the flow of the radiator, filling, waiting to go down, (hoping no spurting went on) then just pouring a bit at a time to bring it up to the top. Is this how i'd do it today?

I dont know how else to get the air out
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Unread 01-17-2008, 12:37 PM   #7
georged
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What you need to do is pop the cap off the radiator BEFORE you go anywhere and fill the radiator to the top, and also fill the overflow bottle to the full mark or just an inch over full.
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Unread 01-17-2008, 12:44 PM   #8
luckyjeep
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is having super hot heat a sign of overheating? after driving a bit i have to turn down the heat, it just burns me lol. But temp is never over 210
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Unread 01-17-2008, 01:05 PM   #9
impuresoul2k3
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if you ever have to replace the thermostat drill a 1/16 hole in it to get the air out
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Unread 01-17-2008, 01:30 PM   #10
tsconver
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if your upper radiator hose is not pressurized and hot after an eighty minute drive then you either have no coolant in the engine or the thermostat is stuck. That being said your heater maybe pulling enough heat out to prevent overheating especially in PA where the temp is much colder. I would check the coolant level before you go home and top it off as appropriate. If teh hose is not hot and it is full start with a thermostat, easy to replace and cheap, should be a regular maintenance item anyway speaking of which I should change mine, LOL
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Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

2003 Grand Cherokee 4.0L Laredo

My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

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Unread 01-17-2008, 01:44 PM   #11
luckyjeep
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oh i have full pressure and had it before i left home today..sorry if didnt note that before. And i havent looked around the jeep engine a lot to be honest...is the stat right under where the upper hose connects? Or did they put it a more fun place!
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Unread 01-17-2008, 02:20 PM   #12
tsconver
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I think it is right under teh upper radiator hose do you have a I6 or V8?
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Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

2003 Grand Cherokee 4.0L Laredo

My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

http://www.treadlightly.org/

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Unread 01-17-2008, 04:08 PM   #13
Windowsrookie
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The upper hose will not get hot until the thermostat opens. The thermostat will not open until your engine reaches 195F. Sitting for 10 minutes probably didn't bring it up to 195F.
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Unread 01-17-2008, 05:27 PM   #14
luckyjeep
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4.0

got home and waited 1/2 hour and went out...level in the tank was fine and the hose wasnt pressurized though. but hose and radiator cap were warm.

BUT, on the drivers side grill, i heard a hissing. I took off the rad cap and the hissing didnt change.

Any idea what would be hissing on that left part of the grill? Maybe some snow fell on it and was burning off? lol

Also, when i squeezed the hose with the cap on, the cap made a 'loose' noise but again, nothing i did changed how the hissing sounded.

no liquid coming out anywhere either.
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Unread 01-26-2008, 08:37 AM   #15
luckyjeep
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continuing with a question....sticking to the radiator hose question...drove 65 miles..stopped for gas then went thru a car wash. Then 7 miles home. Immediately opened up the hood and the hose was hot but not firm. It is 20 degrees out but shouldnt that hose still have been firm after that long drive?

level is still good and there is nothing on the concrete as far as leaks. temp is always 210 and getting nice heat.
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