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I have a 93 k1500 5.7l chevy suburban with roughly 246k. it was overheating to the extreme and idling very rough, with a knocking sound. was also spewing out antifreeze. so, i replaced radiator, water pump, belts, hoses and fan clutch. still have same problem but now antifreeze is leaking from from of muffler. im lost....
 

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I have a 93 k1500 5.7l chevy suburban with roughly 246k. it was overheating to the extreme and idling very rough, with a knocking sound. was also spewing out antifreeze. so, i replaced radiator, water pump, belts, hoses and fan clutch. still have same problem but now antifreeze is leaking from from of muffler. im lost....
I would park it and do not drive it! You most likely have a bad Head gasket. The coolant is leaking past the head gasket and passing through the exhaust valve into the tailpipe. Does it smoke? White smoke?
 

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It's a blown head gasket most likely, even if you don't see white smoke, it could cause the cylinders to not even fire off, hence why you have rough idle and why you see liquid antifreeze coming out of your exhaust. Or, even worse, it blew out near a oil channel and is now leaking into your oil pan.

Either way, these trucks are known for blowing head gaskets when they get old, especially if you drive them hard. Might as well get them replaced, would save you some grief down the road, cause they will eventually blow having that many miles on them if they haven't blown already.
 

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No smoke at all. VERY clean truck by the way.
As mentioned already you best bet is to get it checked ASAP...no matter how clean it is, it doesn't mean jack if the motor is crap.
 
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