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The head gasket could be blown. Is there a lot of water? Is there oil in your radiator?
There is a chance, it could be condensation. If it is just a small amount of milky looking oil on the oil cap.
Possibly blew a head gasket allowing combustion gases to enter the cooling system and force coolant out of the overflow tank. This can be verified by doing a compression check on each cylinder.
when the heater blowes cold you are low on anti frezze, the system is designed so that when the system gets low on coolent the heater will blow cold it is a waning for you to know some thing is wrong, i dought it is a head gasket but it might be, you need to have some one pressure test the cooling system, my first thought is to have someone take a close look at the weap hole on the water pump. we see alot more waterpump leaks then head gaskets on the jeeps.......good luck
Is the antifreeze leaking out of a small hole on the water pump housing just behind the pulley?
You need to know exactly where the leak is coming from. If the pump is not leaking then there is another location.
Generally pumps either work or leak. They do not slow down and overheat the engine.
Where did the smoke come from? Under the hood or out the exhaust pipe? If you blew a head gasket and the exhaust was blowing steam that would cause overheating. The original leak under the engine would cause overheating that then will cause other problems like blown head gaskets.
Did you use stop leak or some quick fix? what did you do to stop the original leak?
Check for possible water in oil, also remove radiator cap and start engine does water want to pump out of radiator, is there white smoke coming out of tail pipe, if yes to any of those blown head gasket, if not sure yet remove spark plugs crank engine over is there any coolant coming out of spark plug holes, if yes blown head gasket, and last have a block test any repair shop can do this.Good luck
Get a compression check to find out if you have a bad head gasket, I have a 96 with the 3.8L that had the same problems at first. then it started to blow out antifreeze thru the expansion tank, the head gasket finally blew the rest of the way going down the highway
You may have a bad water pump, a bad coolant transfer tube behind the engine or a leaking head gasket. The foaming may indicate the head gasket. I would take it to a mechanic and get the head gasket integrity checked out.
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