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Q:

i replace water pump and change the thermostat van still over heat on 1998 Chevrolet Venture

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i also bleed the air out
(3) Answers
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Buy a noncontact thermometer(infrared) at Home Depot and such and take reading of the upper and lower temp at the radiator metal. There should be no more than a 10 degree difference. I suspect you have a bad radiator.