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Q: Why does my car overheat on 1998 Buick Century

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My '98 century started overheating after I replaced a leaking heater hose. I added more antifreeze to replace what I lost from the bad heater hose. I thought that the coolant that I added to the overflow bottle would work its way into the engine but after driving about 6 miles most of the coolant is still in the overflow bottle.
When I drove the car it would start overheating when I was going 40 mph or less. As I accelerated to 55 or 60 mph the temp. gauge would come back to the middle position. Then when I drove the eighth of a mile up my dirt road to my house at 15 mph it was completely in the red.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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THERE IS BLEEDER SRCEW ON TOP OF COOLANT PIPE AT FRONT VALVE COVER NEEDS TO BE OPEN WITH ENGINE RUNNING POUR ANTIFREEZE IN RAD WHEN IT COMES BLEEDER CLOSE IT OFF FILL RAD
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Check that the radiator cap is operating correctly (the radiator cap needs to work correctly to suck fluid from the coolant expansion tank back into the radiator. Air in the cooling system, electric cooling fan not working correctly, radiator inefficiency or worse a blown head gasket can all cause overheating issues. Perhaps you had not enough coolant in the radiator. Try filling the cooling system, run the engine allow it to run, switch it of for an hour refill and run the engine until the radiator no longer needs to be refilled when it has cooled down.
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