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Old 03-07-2007, 08:55 PM   #1
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'94 Yj Engine overcooling?

Help, i can get my 4.0L to warm up, the upper radiator hose is hot, the lower is ice cold. I have replaced the thermostat, water pump, all hoses and coolant. Bled air from system, still wont get to normal operating temp. Any ideas would be great!

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Old 03-07-2007, 09:15 PM   #2
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cheap and easy way is to cut a piece of cardboard big enough to cover the radiator than cut a 4x4 square in the middle of the piece of cardboard. This will allow enough air through so not to overheat the engine but restrict enough to allow normal operating temp. I live in chicago and do this to my jeep every winter and no problems yet

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Old 03-08-2007, 05:52 AM   #3
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Have you checked for flow through the radiator?
Unless it's just incredibly cold where you are a clogged radiator is the only thing I can think of.
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Old 03-08-2007, 10:30 PM   #4
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I second the cardboard trick...but it was 20 degrees tonight and going down the road, my temp gauge was at 210 and the heat was running me outta the cabin. Normal stuff. I've found the cardboard trick only helps it heat up faster, but not run warmer. In the name of academics, I'd unhook the lower rad hose from the rad, plug it, and run a garden hose in the top of the rad and see how long it takes to run out the bottom. Might be blocked, although that should cause an overheating condition, not overcooling. Odd.
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Old 03-09-2007, 11:07 AM   #5
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I had the same thing with my 4cyl. I got a new thermo and still did it. I got a bad new thermo if you replaced it only once try it again. They are cheap and cheaply made.
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Old 03-09-2007, 11:41 AM   #6
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Derrick...you beat me to it. Try another thermostat. I think I had to get three of them last time before I got a good one.
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Old 03-09-2007, 01:40 PM   #7
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another vote for tstat 1st, clogged radiator 2nd. if its warm on top but not the bottom, def clogged radiator
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Old 03-09-2007, 07:15 PM   #8
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Quote:
if its warm on top but not the bottom, def clogged radiator
That's what I'm thinking, the thermostate is before the upper radiator hose, if it wasn't opening then the upper hose shouldn't warm up.
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Old 03-09-2007, 09:34 PM   #9
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Not that its not opening its that its all the way open. Thermos only open alittle, if they are open all the way the water flow is to fast and stays to cool. The hoses my be hot but when working right you should not be able to hold your hand on them.

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