Engine overheating
Senior Member
Joined: Nov 2013
Posts: 503
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From: Jax, FL
Year: 1998
Model: Cherokee
Engine: 4.0L
Excellent! Keep us posted/updated as this site is not only a forum but an archive and a wealth of information for the next guy or gal who might have your same problems
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Senior Member
Joined: Aug 2009
Posts: 914
Likes: 14
From: north carolina
Year: 2000
Model: Cherokee
Engine: 4.0
I had my oil tested by blackstone labs and it came back free of anti freeze. I still suspect I have a small crack in the head, so I am doing this today. I rented the tool from Oreilly's and bought the test liquid. Two cheap tests.
http://www.blackstone-labs.com/
http://www.blackstone-labs.com/
Banned
Joined: Feb 2014
Posts: 2,379
Likes: 18
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: Golen 4.6L
Twenty years ago you could tell if there was coolant in the oil by looking at it. That was because the water was suspended in the oil and not chemically bonded to it. Then the SAE standards for the detergent packages in the oil changed. Now the detergents in most oils are so good that they can chemically bond a lot more water to the oil without ever turning milky. Fewer and fewer oils are turning milky as the oil producers update their additives.
The only way to know for certain is to send off an oil sample for analysis. Otherwise she's just guessing, even if she has clear oil.
The milky coolant advice is one of the reasons I let my 0331 go too long. I kept reading on this very board that coolant in oil would turn it milky, and mine didn't. So even though I was losing coolant, I just thought I had a leak I couldn't find. Toward the end the oil level was showing at least a half a quart high 3000 miles after an oil change, yet the oil was still brown and clear. That's why I know for a fact that the conventional wisdom on this is wrong.
I just did a cumbustion leak test on both the radiator and the overflow tank (I saw this done both ways on youtube). The fluid stayed blue after several minutes on each.
CF Veteran




Joined: May 2012
Posts: 7,965
Likes: 964
From: Lost in the wilds of Virginia
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Yep. Call around and see which one can do that. Worst case, check with Advance and Autozone and see if they have a tool rental program. Most do. The deal is you buy the tool, use it, and return for a full refund. In other words, free rental with 100% refundable deposit. Makes it easier for them to not have to track rentals.
Good news on your exhaust gas test! Now you know!
See my sig, #4.
Good news on your exhaust gas test! Now you know!

See my sig, #4.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Not entirely. My Jeep had the cracked head and you never would have noticed by looking at oil. unless I caught it very early. I knew it was cracked because I had to add like 1/4-1/2 a cup of water to reservoir once a week. And then obviously visual inspection inside the oil fill cap. Even then, I had to have someone give it a little acceleration while I looked. At Idle you didn't really see the bubbles with coolant come out
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
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