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Old 07-17-2013, 10:41 AM   #61
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Let's not forget that earlier Wingit said he had a loss of power accompanying the gauge temp spikes, which to me says that it's not a case of replacing a gauge. Dash gauge readings wouldn't cause a loss of power, but a faulty sensor or an actual problem could. The higher temp readings at the water neck might mean a bad water pump that is working intermittently. The pump is only about $30 and worth the try, IMO. I'm not an expert though, so just a thought.

One last thought- didn't the mishimoto come with a new cap? If the radiator was new (really nice top end radiator too btw), I'm not sure why that would have been a source of the leaking coolant. If your levels are stable now though and no evidence of coolant/water in the oil then maybe that was just a fluke.

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Old 07-17-2013, 11:01 AM   #62
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I've been leaning towards the water pump, as maybe it's pumping but not pumping enough??? I do have a problem of wanting to upgrade instead of just fix, what's a good water pump to get?

Yes the Mishimoto was new and did come with a new cap, but it did not seal well, from what Auto Tire told me. Fluke it may be, but that part of it is fixed now with the new cap, as it does not leak now. I'm passed that point now, just need to figure out what is going on so I can drive it

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Old 07-18-2013, 12:34 PM   #63
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Most water pumps seem to be basically the same at around $24-$30. If you want to go crazy, I see quadratec sells one for like $107: Flowkooler 1750 - FlowKooler Water Pump for 00-06 Jeep® Wrangler TJ with 4.0L I-6 Engine - Quadratec.

If I was in your shoes I'd just run down to the closest auto store and buy what they had in stock. If you want to wait, RockAuto has a few to choose from: RockAuto Parts Catalog (just search water pump).

Let me know how you make out.
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Old 07-18-2013, 01:24 PM   #64
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I was wondering if that FlowKooker was really worth the money... Kinda curious how it works, I guess it has plastic fins that flex?
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Old 07-18-2013, 02:21 PM   #65
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I was wondering if that FlowKooker was really worth the money... Kinda curious how it works, I guess it has plastic fins that flex?
I have been wondering the same thing.
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Old 07-18-2013, 05:17 PM   #66
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Old 07-19-2013, 09:49 AM   #67
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I've been leaning towards the water pump, as maybe it's pumping but not pumping enough??? I do have a problem of wanting to upgrade instead of just fix, what's a good water pump to get?

Yes the Mishimoto was new and did come with a new cap, but it did not seal well, from what Auto Tire told me. Fluke it may be, but that part of it is fixed now with the new cap, as it does not leak now. I'm passed that point now, just need to figure out what is going on so I can drive it
As per usual, you are welcome to do as you wish, but I don't mess with what the Jeep engineers figured out so I only use OEM water pumps, thermostats, coolant, and radiators.

I fix rigs quite often with overheat issues and not once have I not been able to solve them with OEM parts. In this case though, I wouldn't have an issue with the radiator you picked as they seem to be fine.

That said, I just finished a rig with very similar symptoms. Drives fine, put it under load going up a hill or use the AC and the temp would spike, turn the heater on and it would come back down to normal.

Checked and replaced thermostat due to being unable to circulate coolant after the flush.

Checked and reinstalled water pump, did not replace because it was fine.

New coolant didn't help, still had the issue. Finally, the light bulb turned on and I recalled that the radiator drained slower than others I had done.

Against my better wishes, I purchased and installed a new OEM radiator and the rig now works perfectly. There was no external clue that the radiator was the problem except the slow drain.

Point being just because you have what appears to be a good radiator, don't rule it out.

BTW- the temp spike is because the gauge operates like a "gauge" until it exceeds the normal operating temp zone and then it will spike to let you know there is a problem which is also why it pops back into the "good" zone so readily. Gauge is operating as designed.
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Old 07-19-2013, 09:56 AM   #68
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I haven't even tried to get the AC working yet....
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Old 07-19-2013, 11:37 AM   #69
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What BlackMagic says. DOn't worry about the heat/AC as it's not the source of the problem, just an aggravator/alleviator. Replace the water pump or at least remove it to ensure proper operation and if that doesn't solve it, I'd be on the phone with Mishimoto for a replacement.
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Old 07-19-2013, 11:49 AM   #70
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What BlackMagic says. DOn't worry about the heat/AC as it's not the source of the problem, just an aggravator/alleviator. Replace the water pump or at least remove it to ensure proper operation and if that doesn't solve it, I'd be on the phone with Mishimoto for a replacement.
I think it's rather clear its not the radiator.
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Old 07-19-2013, 03:36 PM   #71
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I think it's rather clear its not the radiator.
I don't think that for a second. I believe he said that he attempted or did a heater core back wash and flush which may have moved some crap into some place where it isn't doing anyone any good.
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Old 07-19-2013, 03:42 PM   #72
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That was after the fact with the overheating issues... thinking I had bubbles in the system I couldn't get out after replacing the radiator, thermostat and thermostat housing.
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Old 08-06-2013, 11:21 AM   #73
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That was after the fact with the overheating issues... thinking I had bubbles in the system I couldn't get out after replacing the radiator, thermostat and thermostat housing.
How'd you make out with this? What was the final diagnosis/solution?
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Old 08-06-2013, 11:26 AM   #74
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I haven't yet. I put it on the back burner till my wife is back to work from her surgery, since we are living just off my paycheck.

My guess is to replace the water pump and see what it does.... my buddy that I bought the TJ from said he replaced it 5 years ago... so I guess it could be bad again???
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Old 08-21-2013, 11:56 AM   #75
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My Jeep TJ was overheating when I would pull a hill at 75. When it overheated the next time I jerked the Jeep to the side, opened the hood, and with the engine off tried to turn the fan by hand.

The fan turned pretty freely.

I went to O'Reily's and bought a replacement fan clutch.

30 minutes later I was back on the highway and couldn't get it to overheat.
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Old 08-21-2013, 11:58 AM   #76
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I may do that too, once my wife goes back to work.
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Old 08-21-2013, 12:06 PM   #77
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I had a hard time burping mine after the new radiator. Sounds like you are past that though. Have you thought about putting on an external guage to test. I know you did the laser but that won't measure the water temp.
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Old 08-21-2013, 12:12 PM   #78
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Can you just eliminate the clutch? Good/Bad? My 56 Chevy didn't have one
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Old 08-26-2013, 08:20 AM   #79
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It was the water pump. The impeller broke free from the shaft and was just freewheeling. I also replaced the fan clutch as well. All good now.
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Old 08-26-2013, 10:43 AM   #80
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Yay!

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