Question about 2004 Jeep Grand Cherokee

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Overheating, white smoke, test say its not the heads. What could it be?

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Only one way I know of that coolant can get into the exhaust. Either a cracked cylinder head or blown head gasket (OK that's two ways)
Either condition should show up during a hydrocarbon test at the radiator
You could have a crack in a cylinder wall but unless the vehicle was stored with no antifreeze in it through a cold winter, toe odds of that are nearly zero.
Check the spark plugs for yellow residue, antifreeze will often stain a plug. You could also remove all the plugs and pressurize the cooling system. Leave it pressurized for a few hours and then turn the engine over using the key. Most times when you do that, some antifreeze will come out of the bad cylinder(s) (Make sure fuel system and spark are disabled so you don't start a fire when you do that though) Easy way to do that is to pull the fuel pump relay and unplug the connector on the coil or asd relay.
If you tear the engine down and don't see a problem with the headgaskets, have the heads magnafluxed or dye tested and checked for warpage.
I know you said you had it tested. Someone is wrong here and I'm betting it's not me!!!
Good luck!!.

Posted on Jun 01, 2010


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