4.0 Jeep Engine Problem. Grand Cherokee Overheat. Blown Head Gasket? Cracked Head?

This isn't good. Why is this Jeep overheating?
#keepwrenching #wesselmotorworks #wrenchingwithkenny @WrenchingWithKenny

[oldbiker]

If that jeep was mine, Id fix it, beats payments on a new one and I love the inline 6clyinder .

[bradbex]

i have an 01 Jeep Cherokee with the 4.0 that i just changed the injectors and starter on yesterday. great channel Kenny.

[glennfields]

Wise advice in terms of maintenance and in trusting to have it looked over. Another great video with sound advice. Good video Kenny.

[rockcrusher]

As usual fixing the last guys mistakes, great stuff. Cheers.

[officialWWM]

The Jeep 4.0 is one of the best engines ever built!

[RedPillLife]

Open oil fill cap. Turn on engine and watch for bubbles between cylinder 3 and 5. Mine had a crack between them and you can see bubbles of antifreeze coming up. That is a typical issue with 4.0 heads. Mine did it. Cost 1800 to replace head and related parts.

[northpoint]

The body and everything looks to be in good shape. I would probably replace the head gasket like others have said. Of course, I realize the head could be cracked or warped. That would be a problem. 225k miles is a lot I realize.

[jason-eduo]

Even without a blown head gasket, it's difficult to get all the air out of the coolant in these engines.

[billsmith]

If you see stop leak or any sealer in the cooling system, beware !

[johnchapman]

I would change the head gasket.... would be a great Jeep

[infinityjif]

I'm wondering if the reason why you are getting so many blown heads/gaskets is because of the recent brutal cold snap and people not checking the strength of their antifreeze.

[BRIGGS]

If your coolant looks like chicken soup, it might be time to change it. : P

[xVicissitudesx]

Note to self: When performing a block test on your cooling system, the color won't always change entirely from the hue it starts out as to the hue that indicates hydrocarbons in the coolant. Sometimes the tone will only change slightly but looking at the color of the coolant itself will give you a good indicator. In this case, the coolant starts out as orange or green or what have you, but this coolant is brown almost like chocolate milk which is kind of a dead giveaway.
Also, if your block test goes wrong and you kind of get some LIQUID coolant into the test tube instead of only testing the AIR in the cooling system, then that pretty much voids the results of the test since the coolant can actually make the solution react or on the other hand, neutralize the testing solution so that it won't react at all, despite if there's actually hydrocarbons in the coolant.

[_KID]

4:54 Yeah that's not good. Coolant color might be oily might just be dirty. But yeah that's not good. Should be pretty flat with no

[laragreene]

I would think even a person that didnt know alot about cars would at least look at the coolant, just remove the cap and look in and at the oil level and some things useful. But I guess some ppl havent learned my Jeep has 220, 000 miles on i'm looking for it to get to at least 300, 000 or more!!!! Its strong!!!

[MajorWeakness]

The Jeep 4.0 engine is the best motor Jeep ever had!

[peterbenson]

Id start with a power flush acts like its not circulating just perking maybe.. my guess thats all.

[scuba]

happy new year mr head gasket magnet!! once this older gentleman at the shop says coolant and fluid service ?? ive never heard of that!! ugggh coolant goes acidic and next head gaskets and water pumps

[HoodHandyman]

I'm taking mine to the junkyard tomorrow I have put a lot of money into my 1999 jeep cherokee 4.0 xj I had a transmission put in it recently and freeze plugs but my thermostat was bad and the first cold night i took it out in the morning and it was over i have 340, 000 miles on it I replaced the head a couple years go when i needed to replace the freeze plug on the back wall . my window on passenger switch is out, my gauges go out sometimes, my tires are bad. my alternator is weak. i'm over it . i have a motor for it in the yard i will sell it separately and just move on. it was a loyal truck for every bit 5 or six years but i'm going to get something else and take this L with a smile.

[_KID]

3:52 This is always the scariest part of a diagnosis. Looking at the tailpipe. It will usually tell you everything you need to know. Being from NJ, It is always daunting on cold mornings because there is water out of the tailpipe from your normal hot/cold heat cycling and condensation... then, some say even the functionality of the catalytic converter can produce water, which is true.. WHAT I HAVE FOUND (YouTube Mechanics yes you can use this. Been YouTube Mechanicing since about 2012 or somewhere around there) - IF IT IS A BLOWN HEAD GASKET: It will be "flung" or "forced" out the exhaust, in a forceful and unnatural way. If it is fine and normal operation: The water will appear in calm drops, and look similar to pretty much every other car tailpipe around, some won't be smoking maybe due to fully warmed up but of course some will. Look for congruency.

Bubbles in coolant that aren't known air pockets = don't even need the block test, and eventually you get gun shy of cracked and/or warped heads and/or blocks.. BTDT.