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Next step after this would be to replace the radiator pressure cap, check ALL hoses for deterioration and leaks, check the coolant resevior bottle for leaks, and all connections to it. Check the drain plug and make sure it's snug in the bottom of radiator. Also, you may need a new water pump. Good Luck! I agree about the water pump, even if it seems as if it is working it will give poor circulation and cause overheating when pressurized until the bearings finally go out completely. but check the pressure cap first it is the most obvious and cheapest option, if it is bad when the system builds pressure and heat it will allow coolant to pass freely into the reservoir, but not draw it back in.

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Q: My 1994 camaro z28 overheats and leaks out coolant i already replaced the radiator and thermostat what could the problem be?
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