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Unread 06-06-2015, 07:55 PM   #1
Gausswave
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More getting really hot but not over heating

Last fall I replaced just about every thing except the radiator trying to get heat out of the YJ. It's been flushed multiple times, hoses replaced, pressure tested
(Passed), Burped and had the heater core replaced enough times to where I can do it ~ 15 min. I have a Canadian version so " normal" is 100C. In and around town it stays @ 100C just fine. It's got a 195 deg stat. On the highway it will eventually creep up to just shy of over heating. I'm about to replace the junkyard radiator. It's got some build up on the inside but doesn't looked clogged. Radiator is full. Reservoir is filled to normal. The pump is the normal rotation for a V belt system. I got a new radiator and stat. but I haven't installed them just yet since it's too hot. While I'm waiting for it to cool and before I go that far any thing else I should check?

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Unread 06-06-2015, 08:01 PM   #2
Jeepsr4me
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get a manual gauge and verify what the temp really is... Could just be the gauge./
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Unread 06-06-2015, 08:30 PM   #3
TSEJEEPERS
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Are you running the fan shroud?
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Unread 06-06-2015, 09:52 PM   #4
Gausswave
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Yes I am running a shroud. I don't doubt the temp is high be Aussie I can feel it via the heater, does any one know what the resistance range of the temp sensor I supposed to be? Que?
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Unread 06-06-2015, 10:19 PM   #5
Gausswave
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Where exactly would you take a manual measurement? I have. Temp probe for my fluke meter. But I'm not sure where I could use it?
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Unread 06-07-2015, 06:45 AM   #6
fishadventure
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You can dip it into the radiator neck with the cap off or tape it to the radiator hose and wrap it with some insulation. The insulation lets the probe "see" nearly the temp running through the hose. It will take a moment to settle, but it will tell the truth close enough.
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Unread 06-07-2015, 07:28 AM   #7
Jeepsr4me
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Manual gauge probe goes in the same hole that the temp sensor goes in for a temporary test or there is a couple of plugs on the block you can use..
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Unread 06-07-2015, 08:47 AM   #8
The_Goob
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my jeep is the same way. tub gets super hot too. if i go over 60 the needle goes over 210. the thing actually ran under 200 on the trail in moab in 100* weather but damn if i can go on the highway. it all started for me when i went to 35's
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Unread 06-07-2015, 10:34 AM   #9
Mr.B
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Quote:
Originally Posted by Gausswave View Post
Where exactly would you take a manual measurement? I have. Temp probe for my fluke meter. But I'm not sure where I could use it?
My Fluke temp probe gave me an accurate reading just sticking it through the grill, and touching the radiator.
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Unread 06-07-2015, 01:21 PM   #10
Gausswave
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Quote:
Originally Posted by The_Goob View Post
my jeep is the same way. tub gets super hot too. if i go over 60 the needle goes over 210. the thing actually ran under 200 on the trail in moab in 100* weather but damn if i can go on the highway. it all started for me when i went to 35's
I'm doing 33's but have 4.10 gears and relative to the speedo I'm still over geared by ~ 10%. I have to do an indicated 33MPH to do 30. The only other place it did it to me was running at the beach @ 35MPH. But that was soft sand on 31" tires. How old is your radiator?
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Unread 06-07-2015, 01:24 PM   #11
Gausswave
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My Fluke temp probe gave me an accurate reading just sticking it through the grill, and touching the radiator.
Thanks! I'll give that a try.
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Unread 06-07-2015, 03:13 PM   #12
Gausswave
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FWIW an inside shot.
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Unread 06-07-2015, 07:34 PM   #13
Gausswave
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Well I don't think my gage is off or at least not by much which is not unexpected. Using the thermo couple next to the temp sensor on the back of the motor it gets with in a couple degrees of the Jeep gage. I tried just changing out the thermostat today but it didn't change any thing. My noncontact IR gun gets similar results. 10 min on the highway will get me to the edge of the red on the gage. Any thing less than 50 I'm fine. It idles right @ 195°F like it should.
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Unread 06-07-2015, 07:36 PM   #14
Gausswave
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How much does the fan mater at highway speeds? When I turn the jeep off @ normal temp the clutch has about the same amount of drag as when it's cold. It doesn't spin fee in the wind but it ain't gonna pull much.
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Unread 06-08-2015, 07:11 AM   #15
Jeepsr4me
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The fan disconnects at higher speeds. the air flow from the air moving over and thru jeep engine bay is more than enough.
A fan with a locked up clutch will put a strain on the belt and can slip enough to not let the water pump work
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