Head gaskets do not make black smoke it is white and smells sweet, is that the case?
SOURCE: it is a 1999 jeep cherokee
Try checking the cooling fan clutch..if it is defective, it may cause the jeep to overheat..especially in warmer weather!
SOURCE: 98 cherokee sport, 4.0, it's overheated
i change the radator get a new one it fit the problem
SOURCE: I have a 2001 jeep grand cherokee losing antifreeze no leaks.
good point there is a good chance this has a cracked head
SOURCE: I Have a 98 jeep Cherokee classic i have replaced
If the fan is coming on,then the radiator,is bad,or the engine ,has a crack between the valves,in the head.
SOURCE: 4.0 liter 6 cyl 2000
Either there is still air in the cooling system or you are correct that the headgasket has failed.
Running with the cap of for at least 20 minutes should clear the air out of the cooling system. If it continues to bubble after that than the bubbles are likely combustion gases sneaking by the head gasket.
Let run it with the cap on and let it start pushing coolant into the overflow. Shut it down and smell the coolant reservoir. If it smells like exhaust it is the head gasket.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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