2000 Jeep Cherokee Overheating?

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AcademyBound

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Ok so i have a 2000 jeep grand cherokee that cannot idle for more then 5 min without the heat gauge going to maximun and overheating, 2 days ago i locked my keys in my car with it running and of course after 10 min the whole car was up in smoke and antifreeze pouring out of the bottom , now my engine has a real bad rod knocking sound and im pretty sure i going to need to get a new engine this one is DONE with. I have hada engine tune up , new therastat my water pump checked out its none of those that are causeing it to overheat what else could it possibly be ? also i have no heat the only heat that comes out is from the heat that the engine creates just from running which in wisconsin that is not good enough ? any suggestions to what this might be ? only knowledgable answers please 10 points best answer thanks
 
check for ...
check the engine 's inlet coolant hose.(if colapsed will not allow coolant into the engine,)

check for cracked surge tank,many times that simple thing is the culprit.

check for the RIGHT SPARKS PLUGS has been installed during the last tune up ( the higher the number they have, the higher the temperature they generate to the combustion chamber.)

and the last but not least ,an upside down thermostat.(You said is new ,double check)
 
No heat would be the heater core or a bad thermostat. I have gotten bad thermostats before, worked a few days, then stuck shut.
 
The knocking noise is probably a galled piston rather than a connecting rod. A bad thermostat will certainly cause the engine to overheat, but you should still be able to get heat from the heater. In fact, with a stuck thermostat, running the heater is a good way to keep the temp down (had to do that a few times). If the thermostat is bad, then your coolant control valve would also have to be stuck.

Did the heater work before you got it too hot? You say it overheats in 5 minutes...is that from a cold start-up or after the engine is warmed up? If it's after warm and setting in traffic, is the fan behind the radiator working?

On some engines, it's difficult to expel all of the air in the coolant system and that will cause overheating. I also know of a fellow that had his waterpump fail, only in his case, the impeller was spinning on the shaft. In other words, the waterpump wasn't leaking and the shaft was spinning, but since the impeller wasn't turning, no coolant was being circulated through the engine. That made certain parts of the engine heat up VERY quickly.
 
The knocking noise is probably a galled piston rather than a connecting rod. A bad thermostat will certainly cause the engine to overheat, but you should still be able to get heat from the heater. In fact, with a stuck thermostat, running the heater is a good way to keep the temp down (had to do that a few times). If the thermostat is bad, then your coolant control valve would also have to be stuck.

Did the heater work before you got it too hot? You say it overheats in 5 minutes...is that from a cold start-up or after the engine is warmed up? If it's after warm and setting in traffic, is the fan behind the radiator working?

On some engines, it's difficult to expel all of the air in the coolant system and that will cause overheating. I also know of a fellow that had his waterpump fail, only in his case, the impeller was spinning on the shaft. In other words, the waterpump wasn't leaking and the shaft was spinning, but since the impeller wasn't turning, no coolant was being circulated through the engine. That made certain parts of the engine heat up VERY quickly.
 
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