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Unread 07-15-2011, 11:42 AM   #31
Speed94
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You said you replaced the radiator a year ago. Was it exactly a year or a little less then a year? ie was it changed while it was still cold out? Does fluid leak out of your radiator cap when you see it boiling over (even a little)? What brand radiator cap did you buy?

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Unread 07-15-2011, 11:55 AM   #32
eruji
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Quote:
Was it exactly a year or a little less then a year?
i replaced the stock radiator because it was leaking from the top plastic seam. That was in June of last year. It was replaced with an aftermarket all aluminum rad. Ive tried two different branded radiator caps in the past few months. The first was one from napa, the latest was a "safety" pressure release type from Oreilys. i dont care for the pressure release tab because it feels like another point of failure, but wanted to try another cap. There are no leaks that i can see anywhere in the coolant system. I didnt notice any leaks coming from the cap while boiling over. Im gonna take a look at the oil this weekend to see any signs of coolant in there.
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Unread 07-15-2011, 12:07 PM   #33
Speed94
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I would check for leaks on top of the radiator. Even if its a tiny bit. I would also get an OEM radiator cap. They are around $20 from the dealer. I'm going through the same problem now and it turns out its the radiator. I also just replaced mine in November. Now that its hot, it spikes randomly. The filler neck isn't sealing correctly and causing it to randomly spike the gauge. I noticed a little bit of coolant on top of the radiator groove and when I I looked at the filler neck closer, I noticed it was dripping a little. It was the last thing I checked because I figured that the radiator was new and it couldn't be bad already. I did the chem test for head gasket and there's no coolant in my oil. I also replaced everything you did, including the Temp sensor. New radiator will be here today (under warranty) and I won't be able to get it on until Tuesday when I get back, but I'll let you know if it solves my problem. Maybe you're having the same issue...
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Unread 07-15-2011, 12:38 PM   #34
eruji
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Thanks.. the chem test sounds like an easy way to check for a leak. keep us informed.
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Unread 07-20-2011, 03:43 AM   #35
Speed94
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Replaced the radiator....that didn't fix it. It still overheats when the AC is on and when its not, it runs a little hot. Gonna try back flushing it and see if that works.
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Unread 09-13-2011, 10:39 AM   #36
CCrispe
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I have a 2002 Jeep TJ 4.0 with the same issue, Changed the radiator, therm, hoses, water pump, added a second electric cooling fan 15" pulling 12" pushing and it still overheats only under a load and or with the A/C running. My fan failed and it did get hot on the way home one day. I did the block test and it failed one time however I had a shop repeat the test and it passed three times. No smoke, no water in oil and runs great outside of overheating. Shop thaught it was my Cat. converter.
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Unread 09-13-2011, 11:37 AM   #37
eruji
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Yup, im still having the problem too. So frustrating. i have not gotten the chem test yet. (how much do those typically cost at a shop?)

I did change the oil this weekend, looks fine, no sludge. I flushed the radiator. filled with distilled and waterwetter only. Changed the thermostat (again). Cleaned the AC evaporator as best as i could. Still overheating.

I just got a bluetooth OBD reader and im using an android app to monitor the temps and such. I will post if I see anything strange.
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Unread 09-13-2011, 11:41 AM   #38
eruji
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Quote:
Shop thaught it was my Cat. converter.
what is the reason that would cause an overheat?
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Unread 09-14-2011, 09:41 AM   #39
bigwave
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Silly idea but, can you take your therm. out of the loop completely? Just to see what happens, I have not replaced the thermostate on my jeep so I'm not sure.
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Unread 09-14-2011, 09:58 AM   #40
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Quote:
Originally Posted by eruji View Post
Yup, im still having the problem too. So frustrating. i have not gotten the chem test yet. (how much do those typically cost at a shop?)

I did change the oil this weekend, looks fine, no sludge. I flushed the radiator. filled with distilled and waterwetter only. Changed the thermostat (again). Cleaned the AC evaporator as best as i could. Still overheating.

I just got a bluetooth OBD reader and im using an android app to monitor the temps and such. I will post if I see anything strange.
Which aluminum radiator did you swap in?
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Unread 09-14-2011, 10:06 AM   #41
oldmots
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I would verify that the waterpump you put in is designed for the direction it's actually turning. It sounds to me that you may have low water flow. If you look carefully, there are some reverse direction pumps out there, you may have the wrong one. Another thing is that the thermostat on this car should have a jiggler valve in it to eliminate air pockets behind the thermostat. Most parts store ones do not have this. This valve should be located at 12:00 to vent the system right.I always buy thermostats form the dealer only.
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Unread 09-14-2011, 10:09 AM   #42
Deezul
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had a similar issue, top tank was starting to split in the middle. Not the seam. Replaced radiator and have yet to see 220F
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Unread 09-14-2011, 11:27 AM   #43
eruji
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Quote:
I would verify that the waterpump you put in is designed for the direction it's actually turning
yes, im leaning towards this now too since it would fit the timeline okay. I had the radiator last summer with no issues, but the water pump was put in this April. Is there a way to test the flow by filling a container a certain volume within a timeframe? Also, if the water pump was flowing in the incorrect direction would it just flow in reverse? or not at all? Where is there a diagram of the path and direction?
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Unread 09-14-2011, 12:50 PM   #44
JBTJ
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Quote:
Originally Posted by eruji View Post
yes, im leaning towards this now too since it would fit the timeline okay. I had the radiator last summer with no issues, but the water pump was put in this April. Is there a way to test the flow by filling a container a certain volume within a timeframe? Also, if the water pump was flowing in the incorrect direction would it just flow in reverse? or not at all? Where is there a diagram of the path and direction?
The water can't flow in reverse since the water pump is directional due to it connected to the crank which only spins in the direction the engine is turning. The veins of the water pump could be worn down and not having enough flow to it.
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Unread 09-14-2011, 01:02 PM   #45
Possum67
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^^^^????? Waterpump attached to crank?
waterpump is driven by pully by belt and there are oposite directional pumps as was suggested earlier.
Depends on routing of belt and accessories on engine.

Last edited by Possum67; 09-14-2011 at 01:04 PM.. Reason: add info
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