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first i would completely flush cooling system with a prestone flush kit, second make sure coolant overflow tank is at proper cold level, very important, third fill through bleed valve on thermostat housing until coolant comes out, fourth fill through bleed valve above waterpump, the radiator cap is on during this procedure, use 50-50 antifreeze mix, you can go a step further and loosen small bleed nuts on top of bleed screw run engine and wait for solid coolant to flow out, retighten and that should keep your engine running cooler

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Q: 2003 Chevy Monte Carlo and it seen to run hotter and hotter evey day you don't know want else to change you replaced the Water pump Thermostat and the Temp sensor you started while it was parke?
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