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Radiator replaced, thermostat replaced, heater core, circulates water, air bled from system, still overheats. Even after I flushed system. Please help if you can.Oh, car has a 4.3L V8.
 

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The right mix of antifreeze?

Have you checked to be sure the AC is clear? That covers a large portion of the radiator does it not? Perhaps it is blocked and not allowing air thru.
 

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Common problem, probably had dexcool (orange antifreeze) in it. The smaller hoses that lead back to the heater core are likely plugged/gummed up. Take your hands and squeez them till they let loose anything blocking them.
 

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Did you happen to change the t-stat?

If you did ... remember that the LT1 is REVERSE FLOW COOLING.

You need to buy the proper t-stat. or you WILL overheat.
 

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Radiator replaced, thermostat replaced, heater core, circulates water, air bled from system, still overheats. Even after I flushed system. Please help if you can.Oh, car has a 4.3L V8.

I personally use the hypertech 160 degree thermostat anytime I change out a water pump in the LT-1, even without a power programmer it works just fine.
 

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Woops ... I missed that George ... thanks. Just thought it was worth noting. :smile:
 

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Does it overheat in city driving or even when steady speed on the highway ?
hoss21502,

There are many possibilities. You need to answer the above question so that people can better help you.

One other question: Were all these parts replaced as a part of solving the overheating problem or was there another problem first?

RMC
 
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