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nasty brown 'chocolate milk' in coolant

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Old 07-16-2014, 07:44 PM
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Glad you solved the overheating problem.

But I would not describe 10W-40 oil as having a thin nature. It's actually rather thick for our engines, and is very thick as compared to modern oils used in modern engines.

You've just got a leaky oil pan gasket. Not the oil's fault.
Old 07-16-2014, 07:57 PM
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Originally Posted by Wojtas
?...........

So what I did to solve the overheating.
I went to autozone and picked up a 13 inch electric radiator fan, cut off the stock plug that comes on it and soldered it to the existing electeic radiator fan wiring. Kicks on at around 215 and cools the jeep down real quick. No more overheating episodes!

...............
Which OE fan did the 13" fan replace?
Old 07-16-2014, 09:17 PM
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Originally Posted by djb383

Which OE fan did the 13" fan replace?
Based on how he wrote it and the fact that it cuts on and off, I would assume factory e fan
Old 07-16-2014, 09:33 PM
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why are you going to replace the head if there's nothing wrong with it ?
Old 07-16-2014, 11:23 PM
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Originally Posted by Firestorm500
Glad you solved the overheating problem.

But I would not describe 10W-40 oil as having a thin nature. It's actually rather thick for our engines, and is very thick as compared to modern oils used in modern engines.

You've just got a leaky oil pan gasket. Not the oil's fault.
Woops, my fault. 10w-30, not 10w-40. I know that 10w-40 is basically the basis that older cars run on and basically anything else (street bikes, quads, etc.)
Old 07-16-2014, 11:26 PM
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Originally Posted by Parsnip
Based on how he wrote it and the fact that it cuts on and off, I would assume factory e fan
Yeah, this is something MAJOR that I should have mentioned when I first started this thread. When I bought my xj, it was only cooled by the mechanical clutch-driven fan. I guess the prev. owners efan blew up and he never bothered to change it. Also a contribution to why my jeep liked to overheat so much
Old 07-17-2014, 09:36 AM
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Did u install a new fan clutch on the belt driven fan? If I read the FSM correctly, factory non-a/c XJs (rare) did not have a efan from the factory and apparently they ran cool with just belt fan presuming the cooling system was in top notch condition. Do u have/use a/c?

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Old 07-17-2014, 11:42 AM
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Originally Posted by Wojtas
Woops, my fault. 10w-30, not 10w-40. I know that 10w-40 is basically the basis that older cars run on and basically anything else (street bikes, quads, etc.)
I run 10W-30 Mobil 1, and my oil pan gaskets don't leak.
Old 07-17-2014, 12:01 PM
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Originally Posted by Firestorm500

I run 10W-30 Mobil 1, and my oil pan gaskets don't leak.
I run rotella t3 because cherocar
Old 07-17-2014, 12:24 PM
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t6 or gtfo.
Old 07-17-2014, 02:08 PM
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Oh, great. Now this thread is being transformed into an oil brand thread.
Old 07-17-2014, 02:28 PM
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Originally Posted by Firestorm500
Oh, great. Now this thread is being transformed into an oil brand thread.
No no, it's still on topic...sorta haha. But to be on topic, does the xj have ac? If it has the harness going there, maybe the po was just a little derrr and took it out
Old 07-17-2014, 07:57 PM
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Originally Posted by djb383
Did u install a new fan clutch on the belt driven fan? If I read the FSM correctly, factory non-a/c XJs (rare) did not have a efan from the factory and apparently they ran cool with just belt fan presuming the cooling system was in top notch condition. Do u have/use a/c?
Jeep does have ac, but lines are cut and ac condenser is missing... this xj is really a piece of work.
Old 07-17-2014, 08:35 PM
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With no a/c and condenser, it seems like it should cool ok without an efan IF the fan clutch is good. Did u replace the fan clutch?
Old 07-18-2014, 03:47 PM
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Originally Posted by djb383
With no a/c and condenser, it seems like it should cool ok without an efan IF the fan clutch is good. Did u replace the fan clutch?
Did not replace fan clutch, didnt think it needed replacing..


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