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Old 08-31-2014, 11:39 PM   #1
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still over heating

Back in January I rebuild my 1995 jeep wrangler yj Rio grande 2.5 did it my self now if I put in a thermostat in it will over heat to like 240 tried a 180 and a195 thermostat both overheat. New radiator two row, not so old water pump, new hoses. I'm running a electric fan. Try different things can't figure it out

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Old 09-01-2014, 02:08 AM   #2
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Did you check the heater core?

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Old 09-01-2014, 05:14 AM   #3
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Just throwing this out there but is the gauge or sending unit bad making you think it's overheating?
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Old 09-01-2014, 06:03 AM   #4
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Have you been running without a thermostat since rebuild? Now , when you put one in, it overheats?

What kind of electric fan?
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Old 09-01-2014, 08:34 AM   #5
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It may be a stupid question but are you putting the thermostat in upside down? I know I have done it before and I have professional mechanic friends of mine that have accidentally done the same
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Old 09-01-2014, 09:37 AM   #6
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Flushed out the heater core no problems pretty clean. The gage has been checked new temperature sensor in the block. I though I put the thermostat in the wrong way but I didn't it opened up and was flowing.
Can't remember the brand of the electric fan I think its a 16 inch from Advanced Auto Parts been working good
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Old 09-01-2014, 09:38 AM   #7
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I been driving with no thermostat in it since the rebuild its my dd
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Old 09-01-2014, 10:17 AM   #8
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I had a cracked radiator once that wasn't leaking fluid but because it was cracked it wouldn't hold pressure so I would overheat. Cracked plastic up near the top. Just a thought.
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Old 09-01-2014, 10:22 AM   #9
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The old radiator was blowing steam out. Replaced with a over size two row from O'Reilly
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Old 09-01-2014, 10:36 PM   #10
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I'm wondering if you have the wrong waterpump. The v-belt style runs the other direction. You should have the CCW rotating one for the serpentine belt.

Running backward would work till you put a thermostat in it. You need to pull the top radiator hose off and see where the water flows out from

Might want to go back to the original style clutch fan and shroud, also.
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Old 09-01-2014, 10:52 PM   #11
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It didn't over heat before the rebuild and it still has the same pump as then. It had a thermostat in it before the rebuild

I have been thinking about putting a new fan clutch in with a flex light fan with the o.m shroud
I had the electric fan on before the rebuild and it worked just fine.
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Old 09-02-2014, 05:30 PM   #12
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Is it possible that when you rebuilt it that either a gasket didn't line up properly, or some sealant blocked some of the holes for the coolant to flow properly, also is it overheating per the guage, or because it's blowing the radiator cap. Is it possible that the sender in the block is ok, but the guage itself is bad. Along this line of thinking can you get an infered reading?
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Old 09-02-2014, 05:45 PM   #13
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That's what I was thinking about the gaskets like the head gasket but the gauge is right I got a after market one and check it like that but I don't want to take the head off
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Old 09-02-2014, 06:01 PM   #14
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I'm sure you don't
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Old 09-02-2014, 06:10 PM   #15
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I onetime put an intake manifold on an old lincoln. The oem intakes were bad so I replaced it with a respected aftermarket intake. I was increadably careful, but what I didn't do or think about until after the car ran like crap was that I forgot to check the quality of the mold. I had to take the whole thing back apart only to find lots of excess plastic that should have been trimmed at the factory. And I should have checked. Moral of my story is if you've checked all the things outside the engine. Ie hoses aren't clogged, thermostat is in correctly, waterpump is the correct one, and the belt is on correctly, radiator and thermostat are good. Fan is working, and shrouding is in place (fan works like crap without the shrouding) it's got to be internal I would think. But I'm no professional.
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Old 09-02-2014, 06:16 PM   #16
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That's what I thinking but I don't want to take the head off I wander if I put a high flow water pump on if it would fix my problem

But if the head gasket was off I think it would leak but. The head bolts go thought the head gasket so I don't know how much it can be off
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Old 09-02-2014, 06:23 PM   #17
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Some gaskets are universal fit. Did you compare the old gasket with the new one to make sure it matched, and that there were not any holes you were supposed to cut? Because I agree I don't think it's lined up wrong per se. If you don't remember and still have the old one maybe take it to where you bought the other one and double check.
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Old 09-02-2014, 06:46 PM   #18
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I did check it it match up the same
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Old 09-02-2014, 06:50 PM   #19
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Damn, ok I'm not trying to frustrate you, just trying to think what it could be.
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Old 09-02-2014, 06:56 PM   #20
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The fan has a clutch, perhaps that's not working properly?
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Old 09-02-2014, 07:04 PM   #21
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Electric fan, been on there before rebuild work just fine. Idk
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Old 09-02-2014, 08:23 PM   #22
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Over-heat

I have been following your posts, and all things being equal as running OK since January until the thermostat was put in. I am wondering that if there was an air pocket after the thermostat change that over heated the engine, loosened the head and caused a leak at the head gasket or cracked the head I think I would pressure test the cooling system cold and hot to see if the problem is at the head gasket. At least you will confirm or rule out a leak at that point so that the head my not have to come off. Otherwise there is a blockage/restriction in the system (radiator, lower radiator hose collapsing, thermostat not clocked correctly etc). Good luck, let us know what you find.
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Old 09-02-2014, 09:06 PM   #23
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Andyldavis makes a good point. Did you burp the whole system. Make sure there's no air in the system. When you take it all apart like that there's usually a ton of air in the system.?
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Old 09-03-2014, 07:29 AM   #24
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I don't have the tool to pressure test but I'll work on that
What is a clock thermostat?
I burp the system it takes forever!
By the way thanks for all the info and help this has be helpful
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Old 09-03-2014, 07:34 AM   #25
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The t-stat should have a small hole in it and it needs to go on top to let air escape. A lot of people put them in upside down not looking at the hole.
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Old 09-03-2014, 07:39 PM   #26
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Would that cause it to over heat

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